JP6971793B2 - Zoom lens and image pickup device - Google Patents

Description

The present invention relates to a zoom lens and an image pickup device.

Imaging devices such as TV cameras, movie cameras, photographic cameras, and video cameras are required to have a compact and lightweight zoom lens having a wide angle of view, a high magnification ratio, and high optical performance. In particular, in recent years, for TVs and movie cameras as professional video shooting systems, cameras have been developed that can realize more colorful video expression than before by expanding the color gamut that can be shot. A corresponding zoom lens is required.

Conventionally, as a high-magnification, compact, lightweight, and high-performance zoom lens, it moves from the object side to the first lens group, which is fixed for scaling and has a positive refractive power, and for scaling. The first lens group is composed of an eleventh lens group having a negative refractive power, a twelfth lens group having a positive refractive power, and a thirteenth lens group having a positive refractive power. A zoom lens that employs a 3-group inner focus method in which a 12-lens group is responsible for focusing (focus adjustment) is known (Patent Documents 1 and 2).

Japanese Unexamined Patent Publication No. 2004-341238 Japanese Unexamined Patent Publication No. 2013-221999

In the conventional technique disclosed in the above-mentioned patent document, it is not possible to achieve both high performance of chromatic aberration of magnification on the wide-angle side and high performance of axial chromatic aberration on the telephoto side. In Examples 1 and 2 of Patent Document 1, and Examples 2, 2, 3, 4 and 5 of Patent Document 2, a glass material having a low dispersion and a high partial dispersion ratio in the negative lens of the 11th group. Is used to improve the chromatic aberration of magnification on the wide-angle side, but the improvement of the axial chromatic aberration on the telephoto side, which is disadvantageous accordingly, may be insufficient. Therefore, it may be disadvantageous to provide a zoom lens having a high magnification (high zoom ratio).

Therefore, it is an object of the present invention to provide, for example, a zoom lens having high magnification and high optical performance.

The zoom lens of the present invention includes a first lens group having a positive refractive force that does not move for scaling in order from the object side to the image side, and two to four groups that move for scaling respectively. It is a zoom lens composed of one of the variable magnification lens groups and a lens group having a positive refractive force that does not move due to the variable magnification, and the first lens group is from the object side to the image side. In order, the first sub-lens group having a negative refraction force and not moving for focusing, the second sub-lens group having a positive refraction force and moving for focusing, and the positive refraction force. It consists of a third sub-lens group that has a lens and does not move for focusing, and among the lenses constituting the first sub-lens group, the abbe number of the lens having a negative refractive force and having the largest abbe number is used. The partial dispersion ratio of the lens is set to νn11, the abbe number of the lens having a positive refractive force and the smallest abbe number among the lenses constituting the third sublens group is set to νp13, and the portion of the lens. When the dispersion ratio is θp13,
2.00 <νn11 / νp13
θn11 / θp13 <0.91
A zoom lens characterized by satisfying the conditional expression.
However, the refractive index on the g-line is Ng, the refractive index on the C-line is NC, the refractive index on the d-line is Nd, the refractive index on the F-line is NF, and the Abbe number ν and the partial dispersion ratio θ are ν, respectively. = (Nd-1) / (NF-NC) and θ = (Ng-NF) / (NF-NC)
It shall be represented by.

According to the present invention, for example, it is possible to provide a zoom lens having high magnification and high optical performance.

It is sectional drawing at the time of focusing at infinity at the wide-angle end of the numerical example 1. FIG. Numerical value It is an aberration diagram at the wide-angle end and infinity focusing of Example 1. FIG. It is an aberration diagram at the telephoto end and infinity focusing of the numerical example 1. FIG. It is sectional drawing at the time of focusing at infinity at the wide-angle end of the numerical value Example 2. FIG. It is an aberration diagram at the wide-angle end and infinity focusing of the numerical value Example 2. FIG. It is an aberration diagram at the telephoto end and infinity focusing of the numerical value Example 2. FIG. It is sectional drawing at the time of focusing at infinity at the wide-angle end of the numerical example 3. FIG. It is an aberration diagram at the wide-angle end and infinity focusing of the numerical example 3. FIG. It is an aberration diagram at the telephoto end and infinity focusing of the numerical example 3. FIG. It is sectional drawing at the time of focusing at infinity at the wide-angle end of a numerical example 4. FIG. It is an aberration diagram at the wide-angle end and infinity focusing of the numerical value Example 4. FIG. It is an aberration diagram at the telephoto end and infinity focusing of the numerical example 4. FIG. It is sectional drawing at the time of focusing at infinity at the wide-angle end of the numerical example 5. It is an aberration diagram at the wide-angle end and infinity focusing of the numerical example 5. FIG. It is an aberration diagram at the telephoto end and infinity focusing of the numerical example 5. FIG. It is sectional drawing at the time of focusing at infinity at the wide-angle end of the numerical example 6. It is an aberration diagram at the wide-angle end and infinity focusing of the numerical example 6. It is an aberration diagram at the telephoto end and infinity focusing of the numerical example 6. It is sectional drawing at the time of focusing at infinity at the wide-angle end of the numerical example 7. It is an aberration diagram at the wide-angle end and infinity focusing of the numerical example 7. FIG. It is an aberration diagram at the telephoto end and infinity focusing of the numerical example 7. FIG. It is sectional drawing at the time of focusing at infinity at the wide-angle end of the numerical example 8. It is an aberration diagram at the wide-angle end and infinity focusing of a numerical example 8. It is an aberration diagram at the telephoto end of the numerical example 8 and infinity focusing. It is sectional drawing at the time of focusing at infinity at the wide-angle end of the numerical example 9. FIG. It is an aberration diagram at the wide-angle end and infinity focusing of the numerical example 9. FIG. It is an aberration diagram at the telephoto end of the numerical example 9 and infinity focusing. It is a schematic diagram of the main part of the image pickup apparatus of this invention. It is a schematic diagram about the two-color achromaticity and the secondary spectrum of a positive lens group. It is a schematic diagram about the two-color achromaticity and the secondary spectrum of a negative lens group. It is a schematic diagram of the distribution of the Abbe number ν and the partial dispersion ratio θ of the optical material.

The zoom lens of the present invention has a first lens group U1 having a positive refractive power that does not move for scaling in order from the object side, and a variable magnification lens group of 2 to 4 groups that move at the time of scaling. It is composed of a zoom lens consisting of a final lens group having a positive refractive power that does not move for magnification and a zoom lens. Further, the first lens group U1 is a first sub-lens group U11 having a negative refractive power and not moving in order from the object side to the image side, and a second sub-lens group having a positive refractive power and moving at the time of focusing. It consists of U12 and a third sublens group U13 that has a positive refractive power and does not move.

Among the lenses constituting the first sub-lens group U11, the Abbe number of the lens having a negative refractive force and the largest Abbe number is νn11, the partial dispersion ratio is θn11, and the lenses constituting the three sub-lens group U13. When the Abbe number of the lens having a positive refractive force and the smallest Abbe number is νp13 and the partial dispersion ratio is θp13, the following conditional equations (1) and (2) may be satisfied.
2.00 <νn11 / νp13 ... (1)
θn11 / θp13 <0.91 ... (2)

Preferably, the refractive force at the wide-angle end of the entire zoom lens is φw, the refractive force at the telescopic end is φt, the refractive force of the entire first lens group U1 is φ1, and the lens constituting the first sub-lens group U11. Of these, the refractive power of the lens having a negative refractive power and the largest number of Abbe is φn11, and the refractive power of the lens having a positive refractive power and the smallest number of Abbe among the lenses constituting the three sublens group U13. φp13, among the lenses constituting the first lens group U1, the average value excluding the abbe number νn11 of the lens having a negative refractive force was νan, and the abbe number νp13 of the lens having a positive refractive force was excluded. When the average value is νap
-0.20 <(1 / νn11-1 / νan) / (φ1 / φw) <-0.05 ... (3)
0.005 <(1 / νp13-1 / νap) / (φ1 / φt) <0.020 ... (4)
-0.40 <φn11 / φ1 <-0.15 ... (5)
0.005 <φp13 / φ1 <0.400 ... (6)
Satisfies the conditional expression. Here, when the refractive index of the g-line is Ng, the refractive index of the C-line is NC, the refractive index of the d-line is Nd, and the refractive index of the F-line is NF, the Abbe number ν and the partial dispersion ratio θ are as follows. It is expressed as.
ν = (Nd-1) / (NF-NC)
θ = (Ng-NF) / (NF-NC)

By defining the configuration of the zoom lens, the dispersion characteristics of the lens material, and the conditions of the refractive power in each conditional expression, the secondary spectrum of chromatic aberration of magnification at the wide-angle end and the secondary spectrum of axial chromatic aberration at the telephoto end are corrected. It defines the conditions for achieving good optical performance.

The conditional equations (1) and (2) reduce the secondary spectrum of the chromatic aberration of magnification at the wide-angle end and the secondary spectrum of the axial chromatic aberration at the telephoto end in the first lens group U1, and the secondary spectrum of the axial chromatic aberration at the telephoto end. This is a condition for appropriately correcting the spectrum. The outline of this condition will be described with reference to FIGS. 29 to 31.

FIG. 29 shows a schematic diagram of the two-color achromaticity of the positive lens group and the secondary spectrum of the chromatic aberration of magnification. FIG. 30 shows a schematic diagram of the two-color achromaticity of the positive lens group and the secondary spectrum of the axial chromatic aberration. FIG. 31 shows a schematic diagram of the distribution of the Abbe number ν and the partial dispersion ratio θ of the existing optical materials. As shown in FIG. 31, the existing optical materials are distributed in a narrow range with respect to the Abbe number ν, and the smaller the Abbe number ν, the larger the partial dispersion ratio θ tends to be. The thin-walled chromatic aberration correction condition, which has a predetermined refractive power φ and is composed of two lenses 1 and 2 having refractive powers φ1 and φ2 and Abbe numbers ν1 and ν2, is
φ1 / ν1 + φ2 / ν2 = 0 ... (7)
It is represented by. here,
φ = φ1 + φ2… (8)
Is. When the equation (7) is satisfied, the imaging positions of the C line and the F line match.

At this time, φ1 and φ2 are expressed by the following equations by solving the equations (7) and (8).
φ1 = φ × ν1 / (ν1-ν2)… (9)
φ2 = −φ × ν2 / (ν1-ν2)… (10)

In FIG. 29, in the achromatism of the positive lens group, a material having a large Abbe number ν1 is used as the positive lens 1 and a small material having an Abbe number ν2 is used as the negative lens 2. Therefore, from FIG. 31, the positive lens 1 has a small partial dispersion ratio θ1, and the negative lens 2 has a large partial dispersion ratio θ2. When the chromatic aberration is corrected by the F line and the C line, the image formation point of the g line shifts to the image side. If this deviation amount is defined as the secondary spectral amount Δ of the axial chromatic aberration,
Δ = − (1 / φ) × (θ1-θ2) / (ν1-ν2)… (11)
It is represented by. The chromatic aberration of magnification in FIG. 30 is the same in the case of a negative lens except that the direction is opposite to that of the positive lens. Here, the secondary spectral amounts of the first sub-lens group U11, the second sub-lens group U12, the third sub-lens group U13, and the group after the variable magnification system are set to Δ11, Δ12, Δ13, and ΔZ, and the first is Assuming that the image magnifications of the two sub-lens group U12, the third sub-lens group U13, and the group after the variable magnification system are β12, β13, and βZ, the secondary spectral amount Δ in the entire lens system is expressed by the following equation.
Δ = Δ11 × β12 ² × β13 ² × βZ ² + Δ12 × (1-β12) × β13 ² × βZ ²
＋ △ 13 × (1-β13) × βZ ² ＋ △ Z × (1-βZ)… (12)

In Δ, the chromatic aberration of magnification at the wide-angle end is remarkably generated in the first sub-lens group U11 through which the off-axis ray passes at a high position. Further, the axial chromatic aberration at the telephoto end is remarkably generated in the third sublens group U13 in which the axial marginal ray passes through a high position. Therefore, by suppressing the secondary spectral amount Δ11w of the chromatic aberration of magnification generated in the first sub-lens group U11, the secondary spectral amount Δw of the chromatic aberration of magnification at the wide-angle end can be reduced. Further, by suppressing the secondary spectral amount Δ13t of the axial chromatic aberration at the telephoto end generated in the third sub-lens group U13, the secondary spectral amount Δt of the axial chromatic aberration at the telephoto end can be reduced. However, in the first sub-lens group U11, the axial marginal ray at the telephoto end also passes through a relatively high position, and if the secondary spectral amount Δ11w of the magnifying chromatic aberration at the wide-angle end is suppressed, the secondary chromatic aberration on the axis at the telephoto end is suppressed. There is a problem that the spectral amount Δ11t becomes large. Therefore, it is necessary to increase the suppression amount of the secondary spectral amount Δ13t of the telephoto side axial chromatic aberration in the third sub-lens group U13 in consideration of the deterioration in the first sub-lens group U11. Here, since the third sub-lens group U13 allows the off-axis light beam at the wide-angle end to pass through a relatively low position, even if the secondary spectral amount Δ13t of the axial chromatic aberration at the telephoto end is suppressed, the magnification chromatic aberration at the wide-angle end remains. Does not have a significant effect.

In the conditional equations (1) and (2), the negative lens and the third sub-lens group of the first sub-lens group U11 are used to appropriately correct the secondary spectra of the chromatic aberration of magnification at the wide-angle end and the axial chromatic aberration at the telephoto end. It defines the relationship between the Abbe number ν of the positive lens of U13 and the partial dispersion ratio θ. If the lower limit of conditional expression (1) or the upper limit of conditional expression (2) is not satisfied, the correction of the secondary spectrum of axial chromatic aberration at the telephoto end is insufficient when trying to correct the secondary spectrum of chromatic aberration of magnification at the wide-angle end. do. On the other hand, if the upper limit of the conditional expression (1) or the lower limit of the conditional expression (2) is not satisfied, the secondary spectrum of the chromatic aberration of magnification at the wide-angle end is corrected when trying to correct the secondary spectrum of the axial chromatic aberration at the telephoto end. Is insufficient.

In the conditional equation (3), the Abbe number of the negative lens constituting the first lens group U1 and the first lens group are used in order to achieve both the achromatication of the C line −F line at the wide-angle end and the correction of the secondary spectrum. It defines the relationship between the refractive power φ1 of U1 and the refractive power φw at the wide-angle end of the zoom lens. If the upper limit of the conditional expression (3) is not satisfied, the correction of the secondary spectrum of the chromatic aberration of magnification at the wide-angle end becomes excessive, and it becomes difficult to maintain the performance balance between the axial chromatic aberration and the chromatic aberration of magnification over the entire zoom range. Here, "excessive correction" means that the amount of correction is too large and the correction is adversely affected even though the correction is being attempted. Further, since the C line-F line is achromatic, the refractive power of each lens becomes large, and it becomes difficult to maintain good optical performance. Alternatively, the number of lenses increases, making it difficult to reduce the size and weight. If the lower limit of the conditional expression (3) is not satisfied, it becomes difficult to achieve both the achromatication of the C line −F line and the correction of the secondary spectrum. Further, since the refractive power φw becomes small and the focal length becomes long, it becomes difficult to achieve high scaling.

In the conditional equation (4), the Abbe number ν of the positive lens constituting the first lens group U1 and the first lens are used in order to achieve both the achromatication of the C line −F line at the telephoto end and the correction of the secondary spectrum. It defines the relationship between the refractive power φ1 of the group U1 and the refractive power φt at the telephoto end of the zoom lens. If the upper limit of the conditional expression (4) is not satisfied, the correction of the secondary spectrum of the axial chromatic aberration at the telephoto end becomes excessive, and it becomes difficult to maintain the performance balance between the axial chromatic aberration and the chromatic aberration of magnification over the entire zoom range. .. Further, since the refractive power φt becomes large and the focal length becomes short, it becomes difficult to achieve high scaling. If the lower limit of the conditional expression (4) is not satisfied, it becomes difficult to achieve both the achromatication of the C line −F line and the correction of the secondary spectrum. Further, since the C line-F line is achromatic, the refractive power of each lens becomes large, and it becomes difficult to maintain good optical performance. Alternatively, the number of lenses increases, making it difficult to reduce the size and weight.

The conditional expression (5) has a negative refractive power among the lenses constituting the first sub-lens group U11 in order to achieve both the achromatication of the C line −F line at the wide angle end and the correction of the secondary spectrum. Moreover, the ratio of the refractive power φn11 of the lens having the largest Abbe number to the refractive power φ1 of the first lens group U1 is defined. If the upper limit condition of the conditional expression (5) is not satisfied, it becomes difficult to achromatic the C line-F line, and in order to solve this, the refractive power of each lens is increased and good optical performance is maintained. Becomes difficult. Alternatively, the number of lenses increases, making it difficult to reduce the size and weight. Further, if the lower limit condition of the conditional expression (3) is not satisfied, the effect of correcting the secondary spectrum of the chromatic aberration of magnification at the wide-angle end is reduced.

Conditional expression (6) has a positive refractive power among the lenses constituting the third sub-lens group U13 in order to achieve both the achromatication of the C line −F line at the telephoto end and the correction of the secondary spectrum. Moreover, the ratio of the refractive power φp13 of the lens having the smallest Abbe number to the refractive power φ1 of the first lens group U1 is defined. If the upper limit of the conditional expression (6) is not satisfied, it becomes difficult to achromatic the C line-F line, and in order to solve this, the refractive power of each lens is increased and good optical performance is maintained. Becomes difficult. Alternatively, the number of lenses increases, making it difficult to reduce the size and weight. Further, if the lower limit condition of the conditional expression (3) is not satisfied, the effect of correcting the secondary spectrum of the axial chromatic aberration at the telephoto end is reduced.

FIG. 1 is a cross-sectional view of a lens of the numerical embodiment 1 as the first embodiment of the present invention in a wide-angle end and an object distance infinity in focus state. FIG. 2 shows an aberration diagram at the wide-angle end of Numerical Example 1 and FIG. 3 shows an aberration diagram when focusing at an object distance of infinity at the telephoto end. In each aberration diagram, spherical aberration, chromatic aberration of magnification, solid line in distortion indicates e line, two-dot chain line indicates g line, one-dot chain line indicates C line, and broken line indicates F line. The broken line and the solid line in the astigmatism diagram indicate the meridional image plane and the sagittal image plane, respectively. ω is a half angle of view and Fno is an F number. The spherical aberration diagram is drawn on a scale of 0.4 mm, the astigmatism diagram is drawn on a scale of 0.4 mm, the distortion diagram is drawn on a scale of 5%, and the chromatic aberration diagram is drawn on a scale of 0.05 mm. In each of the following embodiments, the wide-angle end and the telephoto end refer to the zoom positions when the second lens group U2 for scaling is located at both ends of the range in which the second lens group U2 can move on the optical axis with respect to the mechanism. This is the same in the following examples.

In FIG. 1, the first lens group U1 is a lens group that has a positive refractive power and does not move in the optical axis direction due to scaling. The first sub-lens group U11 is a lens group that has a negative refractive power and does not move, the second sub-lens group U12 is a lens group that has a positive refractive power and moves for focusing, and the third sub-lens group U13 is. It is a lens group that has a positive refractive power and does not move. The second lens group U2 and the third lens group U3 are lens groups that move due to scaling. The SP is a diaphragm, and the fourth lens group U4 is a lens group that does not move in the optical axis direction due to scaling having a positive refractive power having an imaging effect. P is a color separation prism, an optical filter, or the like, and is shown as a glass block in the figure. I is an imaging surface.

In this embodiment, the negative lens having the largest Abbe number in the first sub-lens group U11 is a lens composed of a third surface and a fourth surface. Further, the positive lens having the smallest Abbe number in the third sub-lens group U13 is a lens composed of the 13th plane and the 14th plane.

また、数値実施例の面番号に付した記号＊はその面が非球面であることを示す。 Numerical value Example 1 corresponding to the said Example 1 will be described. In all numerical examples, not limited to Numerical Example 1, i indicates the order of surfaces (optical surfaces) from the object side, ri is the radius of curvature of the i-th surface from the object side, and di is the i-th from the object side. The distance between the second surface and the i + 1th surface (on the optical axis) is shown. Further, ndi and νdi represent the refractive index and Abbe number of the medium (optical member) between the i-th plane and the i + 1-th plane, and BF represents the back focus in terms of air. The aspherical shape has an X-axis in the optical axis direction and an H-axis in the direction perpendicular to the optical axis, the traveling direction of light is positive, R is the paraxial radius of curvature, k is a conical normal number, and A3, A4, A5, A6, A7, A8, A9, A10, A11, and A12 are represented by the following equations as paraxial coefficients, respectively. The aspherical shape is represented by the displacement X of the surface in the optical axis direction with respect to the surface apex at the position of the height H from the optical axis. Further, "e-Z" means " ^{x10 -Z} ". The half angle of view is a value obtained by ray tracing.

Further, the symbol * attached to the surface number of the numerical example indicates that the surface is an aspherical surface.

Table 1 shows the corresponding values of each conditional expression of this embodiment. Both of the conditional expressions are satisfied in this numerical example, and a high zoom ratio is achieved while satisfactorily correcting the chromatic aberration of magnification at the wide-angle end and the axial chromatic aberration at the telephoto end.

FIG. 28 is a schematic diagram of an image pickup apparatus (television camera system) using the zoom lens of each embodiment as a photographing optical system. In FIG. 28, 101 is a zoom lens according to any one of Examples 1 to 9. 124 is a camera. The zoom lens 101 is removable from the camera 124. 125 is an image pickup apparatus configured by attaching a zoom lens 101 to a camera 124. The zoom lens 101 has a first lens group F, a variable magnification portion LZ, and a lens group R for imaging. The first lens group F includes a focusing lens group (a moving lens group that moves when focusing) and a fixed lens group that does not move for focusing. The scaling unit LZ includes a lens group that moves on the optical axis for scaling and a lens group that moves on the optical axis to correct image plane fluctuations due to scaling. SP is an aperture stop. 114 and 115 are drive mechanisms such as a helicoid and a cam that drive the first lens group F and the variable magnification portion LZ in the optical axis direction, respectively. Reference numerals 116 to 118 are motors (driving means) for electrically driving the drive mechanisms 114, 115 and the aperture stop SP. Reference numerals 119 to 121 are detectors such as an encoder, a potentiometer, or a photo sensor for detecting the position of the variable magnification portion LZ on the optical axis and the aperture diameter of the aperture aperture SP. In the camera 124, 109 is a glass block corresponding to an optical filter and a color separation optical system in the camera 124, and 110 is a solid-state image pickup element (photoelectric conversion element) such as a CCD sensor or a CMOS sensor that receives an optical image formed by a zoom lens 101. ). Reference numerals 111 and 122 are CPUs that control various drives of the camera 124 and the zoom lens 101.

As described above, by applying the zoom lens of the present invention to a digital video camera, a television camera, or a cinema camera, an image pickup device having high optical performance is realized.

FIG. 4 is a cross-sectional view of a lens of the numerical example 2 as the second embodiment of the present invention in a wide-angle end and an object distance infinity in focus state. FIG. 5 shows an aberration diagram at the wide-angle end of Numerical Example 2 and FIG. 6 shows an aberration diagram when focusing at an object distance of infinity at the telephoto end.

In FIG. 4, the first lens group U1 is a lens group that has a positive refractive power and does not move in the optical axis direction due to scaling. The first sub-lens group U11 is a lens group that has a negative refractive power and does not move, the second sub-lens group U12 is a lens group that has a positive refractive power and moves for focusing, and the third sub-lens group U13 is. It is a lens group that has a positive refractive power and does not move. The second lens group U2 and the third lens group U3 are lens groups that move due to scaling. The SP is a diaphragm, and the fourth lens group U4 is a lens group that does not move in the optical axis direction due to scaling having a positive refractive power having an imaging effect. P is a color separation prism, an optical filter, or the like, and is shown as a glass block in the figure. I is an imaging surface.

In this embodiment, the negative lens having the largest Abbe number in the first sub-lens group U11 is a lens composed of a third surface and a fourth surface. Further, the positive lens having the smallest Abbe number in the third sub-lens group U13 is a lens composed of the 13th plane and the 14th plane.

Table 1 shows the corresponding values of each conditional expression of this embodiment. Both of the conditional expressions are satisfied in this numerical example, and a high zoom ratio is achieved while satisfactorily correcting the chromatic aberration of magnification at the wide-angle end and the axial chromatic aberration at the telephoto end.

FIG. 7 is a cross-sectional view of a lens in a state where the wide-angle end of the numerical example 3 as the third embodiment of the present invention is in focus at an object distance of infinity. FIG. 8 shows an aberration diagram at the wide-angle end of Numerical Example 3 and FIG. 9 shows an aberration diagram at infinity at the object distance at the telephoto end.

In FIG. 7, the first lens group U1 is a lens group that has a positive refractive power and does not move in the optical axis direction due to scaling. The first sub-lens group U11 is a lens group that has a negative refractive power and does not move, the second sub-lens group U12 is a lens group that has a positive refractive power and moves for focusing, and the third sub-lens group U13 is. It is a lens group that has a positive refractive power and does not move. The second lens group U2 and the third lens group U3 are lens groups that move due to scaling. The SP is a diaphragm, and the fourth lens group U4 is a lens group that does not move in the optical axis direction due to scaling having a positive refractive power having an imaging effect. P is a color separation prism, an optical filter, or the like, and is shown as a glass block in the figure. I is an imaging surface.

In this embodiment, the negative lens having the largest Abbe number in the first sub-lens group U11 is a lens composed of a third surface and a fourth surface. Further, the positive lens having the smallest Abbe number in the third sub-lens group U13 is a lens composed of the 13th plane and the 14th plane.

Table 1 shows the corresponding values of each conditional expression of this embodiment. Both of the conditional expressions are satisfied in this numerical example, and a high zoom ratio is achieved while satisfactorily correcting the chromatic aberration of magnification at the wide-angle end and the axial chromatic aberration at the telephoto end.

FIG. 10 is a cross-sectional view of a lens of the numerical embodiment 4 as the fourth embodiment of the present invention in a wide-angle end and an object distance infinity in focus state. FIG. 11 shows an aberration diagram at the wide-angle end of Numerical Example 4, and FIG. 12 shows an aberration diagram when focusing at an object distance of infinity at the telephoto end.

In FIG. 10, the first lens group U1 is a lens group that has a positive refractive power and does not move in the optical axis direction due to scaling. The first sub-lens group U11 is a lens group that has a negative refractive power and does not move, the second sub-lens group U12 is a lens group that has a positive refractive power and moves for focusing, and the third sub-lens group U13 is. It is a lens group that has a positive refractive power and does not move. The second lens group U2 and the third lens group U3 are lens groups that move due to scaling. The SP is a diaphragm, and the fourth lens group U4 is a lens group that does not move in the optical axis direction due to scaling having a positive refractive power having an imaging effect. P is a color separation prism, an optical filter, or the like, and is shown as a glass block in the figure. I is an imaging surface.

In this embodiment, the negative lens having the largest Abbe number in the first sub-lens group U11 is a lens composed of a third surface and a fourth surface. Further, the positive lens having the smallest Abbe number in the third sub-lens group U13 is a lens composed of the 13th plane and the 14th plane.

Table 1 shows the corresponding values of each conditional expression of this embodiment. Both of the conditional expressions are satisfied in this numerical example, and a high zoom ratio is achieved while satisfactorily correcting the chromatic aberration of magnification at the wide-angle end and the axial chromatic aberration at the telephoto end.

FIG. 13 is a cross-sectional view of a lens of the numerical embodiment 5 as the fifth embodiment of the present invention in a wide-angle end and an object distance infinity in focus state. FIG. 14 shows an aberration diagram at the wide-angle end of Numerical Example 5, and FIG. 15 shows an aberration diagram when focusing at an object distance of infinity at the telephoto end.

In FIG. 13, the first lens group U1 is a lens group that has a positive refractive power and does not move in the optical axis direction due to scaling. The first sub-lens group U11 is a lens group that has a negative refractive power and does not move, the second sub-lens group U12 is a lens group that has a positive refractive power and moves for focusing, and the third sub-lens group U13 is. It is a lens group that has a positive refractive power and does not move. The second lens group U2 and the third lens group U3 are lens groups that move due to scaling. The SP is a diaphragm, and the fourth lens group U4 is a lens group that does not move in the optical axis direction due to scaling having a positive refractive power having an imaging effect. P is a color separation prism, an optical filter, or the like, and is shown as a glass block in the figure. I is an imaging surface.

In this embodiment, the negative lens having the largest Abbe number in the first sub-lens group U11 is a lens composed of a third surface and a fourth surface. Further, the positive lens having the smallest Abbe number in the third sub-lens group U13 is a lens composed of the 13th plane and the 14th plane.

Table 1 shows the corresponding values of each conditional expression of this embodiment. Both of the conditional expressions are satisfied in this numerical example, and a high zoom ratio is achieved while satisfactorily correcting the chromatic aberration of magnification at the wide-angle end and the axial chromatic aberration at the telephoto end.

FIG. 16 is a cross-sectional view of a lens of the numerical embodiment 6 as the sixth embodiment of the present invention in a wide-angle end and an object distance infinity in focus state. FIG. 17 shows an aberration diagram at the wide-angle end of Numerical Example 6 and FIG. 18 shows an aberration diagram when focusing at an object distance of infinity at the telephoto end.

In FIG. 16, the first lens group U1 is a lens group that has a positive refractive power and does not move in the optical axis direction due to scaling. The first sub-lens group U11 is a lens group that has a negative refractive power and does not move, the second sub-lens group U12 is a lens group that has a positive refractive power and moves for focusing, and the third sub-lens group U13 is. It is a lens group that has a positive refractive power and does not move. The second lens group U2 and the third lens group U3 are lens groups that move due to scaling. The SP is a diaphragm, and the fourth lens group U4 is a lens group that does not move in the optical axis direction due to scaling having a positive refractive power having an imaging effect. P is a color separation prism, an optical filter, or the like, and is shown as a glass block in the figure. I is an imaging surface.

In this embodiment, the negative lens having the largest Abbe number in the first sub-lens group U11 is a lens composed of a third surface and a fourth surface. Further, the positive lens having the smallest Abbe number in the third sub-lens group U13 is a lens composed of the 13th plane and the 14th plane.

Table 1 shows the corresponding values of each conditional expression of this embodiment. Both of the conditional expressions are satisfied in this numerical example, and a high zoom ratio is achieved while satisfactorily correcting the chromatic aberration of magnification at the wide-angle end and the axial chromatic aberration at the telephoto end.

FIG. 19 is a cross-sectional view of a lens of the numerical embodiment 7 as the seventh embodiment of the present invention in a wide-angle end and an object distance infinity in focus state. FIG. 20 shows an aberration diagram at the time of focusing at the object distance infinity at the wide-angle end of the numerical example 7 and the telephoto end of FIG. 21.

In FIG. 19, the first lens group U1 is a lens group that has a positive refractive power and does not move in the optical axis direction due to scaling. The first sub-lens group U11 is a lens group that has a negative refractive power and does not move, the second sub-lens group U12 is a lens group that has a positive refractive power and moves for focusing, and the third sub-lens group U13 is. It is a lens group that has a positive refractive power and does not move. The second lens group U2 and the third lens group U3 are lens groups that move due to scaling. The SP is a diaphragm, and the fourth lens group U4 is a lens group that does not move in the optical axis direction due to scaling having a positive refractive power having an imaging effect. P is a color separation prism, an optical filter, or the like, and is shown as a glass block in the figure. I is an imaging surface.

In this embodiment, the negative lens having the largest Abbe number in the first sub-lens group U11 is a lens composed of a third surface and a fourth surface. Further, the positive lens having the smallest Abbe number in the third sub-lens group U13 is a lens composed of the 13th plane and the 14th plane.

Table 1 shows the corresponding values of each conditional expression of this embodiment. Both of the conditional expressions are satisfied in this numerical example, and a high zoom ratio is achieved while satisfactorily correcting the chromatic aberration of magnification at the wide-angle end and the axial chromatic aberration at the telephoto end.

FIG. 22 is a cross-sectional view of the lens of the numerical embodiment 8 as the eighth embodiment of the present invention in the wide-angle end and the object distance infinity in focus state. FIG. 23 shows the wide-angle end of the numerical embodiment 8, and FIG. 24 shows the aberration diagram at the time of focusing at the object distance infinity at the telephoto end.

In FIG. 22, the first lens group U1 is a lens group that has a positive refractive power and does not move in the optical axis direction due to scaling. The first sub-lens group U11 is a lens group that has a negative refractive power and does not move, the second sub-lens group U12 is a lens group that has a positive refractive power and moves for focusing, and the third sub-lens group U13 is. It is a lens group that has a positive refractive power and does not move. The second lens group U2, the third lens group U3, and the fourth lens group U4 are lens groups that move due to scaling. The SP is a diaphragm, and the fifth lens group U5 is a lens group that does not move in the optical axis direction due to scaling having a positive refractive power having an imaging effect. P is a color separation prism, an optical filter, or the like, and is shown as a glass block in the figure. I is an imaging surface.

In this embodiment, the negative lens having the largest Abbe number in the first sub-lens group U11 is a lens composed of a third surface and a fourth surface. Further, the positive lens having the smallest Abbe number in the third sub-lens group U13 is a lens composed of the 13th plane and the 14th plane.

Table 1 shows the corresponding values of each conditional expression of this embodiment. Both of the conditional expressions are satisfied in this numerical example, and a high zoom ratio is achieved while satisfactorily correcting the chromatic aberration of magnification at the wide-angle end and the axial chromatic aberration at the telephoto end.

FIG. 25 is a cross-sectional view of a lens of the numerical embodiment 9 as the embodiment of the present invention in a wide-angle end and an object distance infinity in focus state. FIG. 26 shows an aberration diagram at the wide-angle end of Numerical Example 9 and FIG. 27 shows an aberration diagram at infinity at the object distance at the telephoto end.

In FIG. 25, the first lens group U1 is a lens group that has a positive refractive power and does not move in the optical axis direction due to scaling. The first sub-lens group U11 is a lens group that has a negative refractive power and does not move, the second sub-lens group U12 is a lens group that has a positive refractive power and moves for focusing, and the third sub-lens group U13 is. It is a lens group that has a positive refractive power and does not move. The second lens group U2, the third lens group U3, the fourth lens group U4, and the fifth lens group U5 are lens groups that move due to scaling. The SP is a diaphragm, and the sixth lens group U6 is a lens group that does not move in the optical axis direction due to scaling having a positive refractive power having an imaging effect. P is a color separation prism, an optical filter, or the like, and is shown as a glass block in the figure. I is an imaging surface.

In this embodiment, the negative lens having the largest Abbe number in the first sub-lens group U11 is a lens composed of a third surface and a fourth surface. Further, the positive lens having the smallest Abbe number in the third sub-lens group U13 is a lens composed of the 13th plane and the 14th plane.

Table 1 shows the corresponding values of each conditional expression of this embodiment. Both of the conditional expressions are satisfied in this numerical example, and a high zoom ratio is achieved while satisfactorily correcting the chromatic aberration of magnification at the wide-angle end and the axial chromatic aberration at the telephoto end.

Although the preferred embodiments of the present invention have been described above, it goes without saying that the present invention is not limited to these examples, and various modifications and modifications can be made within the scope of the gist thereof.

(Numerical Example 1)
Unit mm
Surface number rd nd vd θgF Effective diameter Focal length
1 215.81654 4.17661 1.834000 37.16 0.5776 85.014 -76.194
2 48.89736 17.77884 69.723
3 -193.87903 2.10000 1.618000 63.33 0.5441 69.719 -164.621
4 216.66127 0.20000 68.928
5 77.91068 4.44086 1.922860 18.90 0.6495 69.148 230.839
6 118.61516 3.39029 68.522
7 184.78449 2.00000 1.805181 25.42 0.6161 68.072 -250.067
8 96.31140 0.60630 66.772
9 104.68459 13.00826 1.496999 81.54 0.5375 66.834 109.796
10 -109.94470 10.26684 67.109
11 92.04119 6.45767 1.496999 81.54 0.5375 64.139 217.304
12 598.27674 0.14681 63.623
13 114.62405 4.45397 1.808095 22.76 0.6307 62.002 191.969
14 419.21043 0.30000 61.346
15 188.03395 2.00000 1.755199 27.51 0.6103 60.038 -72.146
16 42.32874 13.81180 1.496999 81.54 0.5375 55.743 75.155
17 -290.41852 0.15000 55.579
18 62.27505 6.35883 1.772499 49.60 0.5520 53.901 95.456
19 372.99569 (variable) 53.275
20 * 48.23132 1.00000 1.903660 31.32 0.5946 21.916 -17.375
21 11.79444 6.03366 17.601
22 -26.03854 3.53836 1.922860 18.90 0.6495 17.361 26.358
23 -13.48705 0.75000 1.816000 46.62 0.5568 17.615 -13.168
24 55.56854 0.31317 17.850
25 26.55232 3.37032 1.575006 41.50 0.5767 18.299 36.224
26 -94.63213 (variable) 18.238
27 -26.90093 0.75000 1.772499 49.60 0.5520 18.788 -20.263
28 38.33100 2.53316 1.846660 23.78 0.6205 20.570 42.933
29 -841.45376 (variable) 21.010
30 (Aperture) ∞ 1.30000 26.644
31 3064.43332 4.47512 1.617722 49.81 0.5603 27.690 53.262
32 -33.39992 0.15000 28.287
33 124.91422 2.65616 1.517417 52.43 0.5564 29.033 150.781
34 -208.80121 0.15000 29.082
35 44.77096 6.56043 1.487490 70.23 0.5300 29.034 43.444
36 -38.50375 1.00000 1.834000 37.16 0.5776 28.717 -42.518
37 493.41848 36.00000 28.598
38 77.98861 4.07868 1.487490 70.23 0.5300 28.371 75.435
39 -68.83078 0.10000 28.206
40 74.28692 1.00000 1.834000 37.16 0.5776 27.068 -29.975
41 18.67856 7.80053 1.517417 52.43 0.5564 25.372 28.563
42 -62.02131 3.68424 25.450
43 -41.36183 2.77180 1.487490 70.23 0.5300 25.019 136.360
44 -26.09211 1.00000 1.816000 46.62 0.5568 25.187 -38.281
45 -157.10302 0.60000 26.247
46 51.38269 7.82352 1.496999 81.54 0.5375 27.412 42.129
47 -33.71503 4.50000 27.601
48 ∞ 33.00000 1.608590 46.44 0.5664 40.000
49 ∞ 13.20000 1.516330 64.15 0.5352 40.000
50 ∞ (variable) 40.000
Image plane ∞

20th surface of aspherical data
K = -3.02619e + 001 A 4 = 2.24478e-005 A 6 = -2.99801e-007 A 8 = 7.08419e-009 A10 = -3.76526e-011 A12 = -1.80438e-013 A14 = 2.02751e-015 A16 =-9.51394e-018
A 3 = 5.77249e-006 A 5 = 2.58564e-006 A 7 = -6.13157e-008 A 9 = 3.93859e-010 A11 = -2.17157e-012 A13 = 1.39559e-014 A15 = 2.52043e-017

Various data Zoom ratio 17.30

Focal length 6.40 12.80 25.98 52.22 110.72
F number 1.87 1.87 1.87 1.88 3.00
Half angle of view 40.67 23.25 11.95 6.01 2.84
Image height 5.50 5.50 5.50 5.50 5.50
Lens total length 303.40 303.40 303.40 303.40 303.40
BF 8.02 8.02 8.02 8.02 8.02

d19 0.08 19.23 32.33 40.82 46.15
d26 46.41 24.67 10.03 3.23 5.86
d29 7.11 9.69 11.23 9.54 1.59
d50 8.02 8.02 8.02 8.02 8.02

Entrance pupil position 49.14 72.77 112.02 175.55 283.18
Exit pupil position 279.47 279.47 279.47 279.47 279.47
Front principal point position 55.69 86.18 140.49 237.83 439.06
Rear principal point position 1.62 -4.78 -17.96 -44.20 -102.70

Zoom lens group Data group Start surface Focal length Lens configuration length Front principal point position Posterior principal point position
1 1 45.60 91.65 53.37 17.21
2 20 -14.30 15.01 0.77 -11.12
3 27 -38.90 3.28 -0.10 -1.90
4 30 63.54 131.85 74.78 -143.34

(Numerical Example 2)
Unit mm
Surface number rd nd vd θgF Effective diameter Focal length
1 187.47861 4.17661 1.834000 37.16 0.5776 85.074 -77.350
2 47.73266 17.86902 69.487
3 -212.61791 2.10000 1.618000 63.33 0.5441 69.483 -168.946
4 207.45438 0.20000 68.521
5 76.02999 4.80433 1.922860 18.90 0.6495 68.562 202.416
6 123.26599 3.10200 67.902
7 181.46955 2.00000 1.854780 24.80 0.6122 67.344 -310.365
8 107.62032 0.45816 66.002
9 115.22296 12.08948 1.438750 94.66 0.5340 66.045 131.513
10 -112.44496 10.46545 66.237
11 100.50771 5.93477 1.433870 95.10 0.5373 63.142 257.546
12 960.32008 0.37814 62.730
13 150.06275 3.68618 1.800000 29.84 0.6017 61.484 303.097
14 384.51360 0.30000 60.779
15 120.94686 2.00000 1.728250 28.46 0.6077 59.040 -88.221
16 41.88967 13.77514 1.496999 81.54 0.5375 55.594 75.174
17 -316.37286 0.15000 55.455
18 62.30850 6.48644 1.788001 47.37 0.5559 54.005 91.642
19 420.12801 (variable) 53.391
20 * 48.23132 1.00000 1.903660 31.32 0.5946 21.916 -17.375
21 11.79444 6.03366 17.601
22 -26.03854 3.53836 1.922860 18.90 0.6495 17.361 26.358
23 -13.48705 0.75000 1.816000 46.62 0.5568 17.615 -13.168
24 55.56854 0.31317 17.851
25 26.55232 3.37032 1.575006 41.50 0.5767 18.300 36.224
26 -94.63213 (variable) 18.239
27 -26.90093 0.75000 1.772499 49.60 0.5520 18.788 -20.263
28 38.33100 2.53316 1.846660 23.78 0.6205 20.570 42.933
29 -841.45376 (variable) 21.010
30 (Aperture) ∞ 1.30000 26.645
31 3064.43332 4.47512 1.617722 49.81 0.5603 27.690 53.262
32 -33.39992 0.15000 28.287
33 124.91422 2.65616 1.517417 52.43 0.5564 29.033 150.781
34 -208.80121 0.15000 29.082
35 44.77096 6.56043 1.487490 70.23 0.5300 29.034 43.444
36 -38.50375 1.00000 1.834000 37.16 0.5776 28.717 -42.518
37 493.41848 36.00000 28.598
38 77.98861 4.07868 1.487490 70.23 0.5300 28.372 75.435
39 -68.83078 0.10000 28.207
40 74.28692 1.00000 1.834000 37.16 0.5776 27.068 -29.975
41 18.67856 7.80053 1.517417 52.43 0.5564 25.393 28.563
42 -62.02131 3.68424 25.470
43 -41.36183 2.77180 1.487490 70.23 0.5300 25.039 136.360
44 -26.09211 1.00000 1.816000 46.62 0.5568 25.207 -38.281
45 -157.10302 0.60000 26.270
46 51.38269 7.82352 1.496999 81.54 0.5375 27.438 42.129
47 -33.71503 4.50000 27.627
48 ∞ 33.00000 1.608590 46.44 0.5664 40.000
49 ∞ 13.20000 1.516330 64.15 0.5352 40.000
50 ∞ (variable) 40.000
Image plane ∞

20th surface of aspherical data
K = -3.02619e + 001 A 4 = 2.24478e-005 A 6 = -2.99801e-007 A 8 = 7.08419e-009 A10 = -3.76526e-011 A12 = -1.80438e-013 A14 = 2.02751e-015 A16 =-9.51394e-018
A 3 = 5.77249e-006 A 5 = 2.58564e-006 A 7 = -6.13157e-008 A 9 = 3.93859e-010 A11 = -2.17157e-012 A13 = 1.39559e-014 A15 = 2.52043e-017

Various data Zoom ratio 17.30

Focal length 6.40 12.80 25.98 52.22 110.72
F number 1.87 1.87 1.87 1.88 3.00
Half angle of view 40.67 23.25 11.95 6.01 2.84
Image height 5.50 5.50 5.50 5.50 5.50
Lens total length 301.75 301.75 301.75 301.75 301.75
BF 8.02 8.02 8.02 8.02 8.02

d19 0.10 19.26 32.35 40.85 46.17
d26 46.41 24.67 10.03 3.23 5.86
d29 7.11 9.69 11.23 9.54 1.59
d50 8.02 8.02 8.02 8.02 8.02

Entrance pupil position 49.44 73.07 112.31 175.85 283.47
Exit pupil position 279.47 279.47 279.47 279.47 279.47
Front principal point position 55.99 86.48 140.78 238.12 439.36
Rear principal point position 1.62 -4.78 -17.96 -44.20 -102.70

Zoom lens group Data group Start surface Focal length Lens configuration length Front principal point position Posterior principal point position
1 1 45.60 89.98 53.66 17.24
2 20 -14.30 15.01 0.77 -11.12
3 27 -38.90 3.28 -0.10 -1.90
4 30 63.54 131.85 74.78 -143.34

(Numerical Example 3)
Unit mm
Surface number rd nd vd θgF Effective diameter Focal length
1 212.94959 4.17661 1.788001 47.37 0.5559 85.248 -82.581
2 49.60073 17.01460 69.931
3 -237.75062 2.10000 1.618000 63.33 0.5441 69.926 -201.256
4 263.77756 0.20000 68.675
5 81.76473 3.43830 1.922860 18.90 0.6495 67.979 334.373
6 108.50226 4.16991 67.289
7 209.69573 2.00000 1.851500 40.78 0.5695 66.756 -209.742
8 96.32682 0.14297 65.057
9 97.02019 12.53347 1.438750 94.66 0.5340 65.054 122.489
10 -116.38082 5.21633 65.182
11 92.40880 12.55205 1.433870 95.10 0.5373 64.605 146.954
12 -198.79131 2.72178 63.572
13 184.99920 1.48312 1.846660 23.88 0.6218 59.590 1405.898
14 217.84237 0.30000 59.126
15 134.76551 2.00000 1.717362 29.52 0.6047 58.293 -99.255
16 46.53913 12.72797 1.496999 81.54 0.5375 55.630 80.231
17 -258.38388 0.15000 55.551
18 63.61778 6.70193 1.788001 47.37 0.5559 54.255 88.685
19 643.77778 (variable) 53.663
20 * 48.23132 1.00000 1.903660 31.32 0.5946 21.919 -17.375
21 11.79444 6.03366 17.601
22 -26.03854 3.53836 1.922860 18.90 0.6495 17.360 26.358
23 -13.48705 0.75000 1.816000 46.62 0.5568 17.613 -13.168
24 55.56854 0.31317 17.845
25 26.55232 3.37032 1.575006 41.50 0.5767 18.292 36.224
26 -94.63213 (variable) 18.230
27 -26.90093 0.75000 1.772499 49.60 0.5520 18.787 -20.263
28 38.33100 2.53316 1.846660 23.78 0.6205 20.569 42.933
29 -841.45376 (variable) 21.009
30 (Aperture) ∞ 1.30000 26.643
31 3064.43332 4.47512 1.617722 49.81 0.5603 27.689 53.262
32 -33.39992 0.15000 28.286
33 124.91422 2.65616 1.517417 52.43 0.5564 29.032 150.781
34 -208.80121 0.15000 29.081
35 44.77096 6.56043 1.487490 70.23 0.5300 29.033 43.444
36 -38.50375 1.00000 1.834000 37.16 0.5776 28.716 -42.518
37 493.41848 36.00000 28.597
38 77.98861 4.07868 1.487490 70.23 0.5300 28.370 75.435
39 -68.83078 0.10000 28.205
40 74.28692 1.00000 1.834000 37.16 0.5776 27.067 -29.975
41 18.67856 7.80053 1.517417 52.43 0.5564 25.306 28.563
42 -62.02131 3.68424 25.385
43 -41.36183 2.77180 1.487490 70.23 0.5300 24.954 136.360
44 -26.09211 1.00000 1.816000 46.62 0.5568 25.122 -38.281
45 -157.10302 0.60000 26.173
46 51.38269 7.82352 1.496999 81.54 0.5375 27.328 42.129
47 -33.71503 4.50000 27.518
48 ∞ 33.00000 1.608590 46.44 0.5664 40.000
49 ∞ 13.20000 1.516330 64.15 0.5352 40.000
50 ∞ (variable) 40.000
Image plane ∞

20th surface of aspherical data
K = -3.02619e + 001 A 4 = 2.24478e-005 A 6 = -2.99801e-007 A 8 = 7.08419e-009 A10 = -3.76526e-011 A12 = -1.80438e-013 A14 = 2.02751e-015 A16 =-9.51394e-018
A 3 = 5.77249e-006 A 5 = 2.58564e-006 A 7 = -6.13157e-008 A 9 = 3.93859e-010 A11 = -2.17157e-012 A13 = 1.39559e-014 A15 = 2.52043e-017

Various data Zoom ratio 17.30

Focal length 6.40 12.80 25.98 52.22 110.72
F number 1.87 1.87 1.87 1.88 3.00
Half angle of view 40.67 23.25 11.95 6.01 2.84
Image height 5.50 5.50 5.50 5.50 5.50
Lens total length 301.41 301.41 301.41 301.41 301.41
BF 8.02 8.02 8.02 8.02 8.02

d19 0.10 19.26 32.35 40.85 46.17
d26 46.41 24.67 10.03 3.23 5.86
d29 7.11 9.69 11.23 9.54 1.59
d50 8.02 8.02 8.02 8.02 8.02

Entrance pupil position 49.57 73.20 112.44 175.98 283.60
Exit pupil position 279.47 279.47 279.47 279.47 279.47
Front principal point position 56.12 86.61 140.92 238.25 439.49
Rear principal point position 1.62 -4.78 -17.96 -44.20 -102.70

Zoom lens group Data group Start surface Focal length Lens configuration length Front principal point position Posterior principal point position
1 1 45.60 89.63 53.79 17.24
2 20 -14.30 15.01 0.77 -11.12
3 27 -38.90 3.28 -0.10 -1.90
4 30 63.54 131.85 74.78 -143.34

(Numerical Example 4)
Unit mm
Surface number rd nd vd θgF Effective diameter Focal length
1 256.86776 4.17661 1.834000 37.16 0.5776 85.096 -71.169
2 48.10435 16.92446 69.519
3 -293.62486 2.10000 1.433870 95.10 0.5373 69.516 -250.000
4 173.06932 0.20000 68.552
5 71.55834 5.13766 1.922860 18.90 0.6495 68.512 185.366
6 117.71531 4.37413 67.799
7 268.18403 2.00000 1.892860 20.36 0.6393 67.154 -227.467
8 115.91494 -0.03491 66.394
9 112.91842 13.65018 1.438750 94.66 0.5340 66.438 116.333
10 -90.11853 9.64584 66.631
11 128.36548 3.82996 1.438750 94.66 0.5340 61.993 502.680
12 303.24864 0.14368 61.493
13 164.53128 3.59476 1.959060 17.47 0.6598 60.974 301.557
14 371.07919 0.30000 60.246
15 105.35585 2.00000 1.805181 25.42 0.6161 58.389 -82.686
16 40.67831 12.30057 1.496999 81.54 0.5375 54.820 84.291
17 1149.85482 0.15000 54.833
18 58.43730 8.48577 1.772499 49.60 0.5520 55.059 71.223
19 -959.46339 (variable) 54.535
20 * 48.23132 1.00000 1.903660 31.32 0.5946 21.913 -17.375
21 11.79444 6.03366 17.601
22 -26.03854 3.53836 1.922860 18.90 0.6495 17.362 26.358
23 -13.48705 0.75000 1.816000 46.62 0.5568 17.617 -13.168
24 55.56854 0.31317 17.856
25 26.55232 3.37032 1.575006 41.50 0.5767 18.307 36.224
26 -94.63213 (variable) 18.247
27 -26.90093 0.75000 1.772499 49.60 0.5520 18.788 -20.263
28 38.33100 2.53316 1.846660 23.78 0.6205 20.570 42.933
29 -841.45376 (variable) 21.010
30 (Aperture) ∞ 1.30000 26.645
31 3064.43332 4.47512 1.617722 49.81 0.5603 27.690 53.262
32 -33.39992 0.15000 28.287
33 124.91422 2.65616 1.517417 52.43 0.5564 29.033 150.781
34 -208.80121 0.15000 29.082
35 44.77096 6.56043 1.487490 70.23 0.5300 29.034 43.444
36 -38.50375 1.00000 1.834000 37.16 0.5776 28.717 -42.518
37 493.41848 36.00000 28.598
38 77.98861 4.07868 1.487490 70.23 0.5300 28.372 75.435
39 -68.83078 0.10000 28.207
40 74.28692 1.00000 1.834000 37.16 0.5776 27.068 -29.975
41 18.67856 7.80053 1.517417 52.43 0.5564 25.302 28.563
42 -62.02131 3.68424 25.382
43 -41.36183 2.77180 1.487490 70.23 0.5300 24.952 136.360
44 -26.09211 1.00000 1.816000 46.62 0.5568 25.121 -38.281
45 -157.10302 0.60000 26.174
46 51.38269 7.82352 1.496999 81.54 0.5375 27.330 42.129
47 -33.71503 4.50000 27.521
48 ∞ 33.00000 1.608590 46.44 0.5664 40.000
49 ∞ 13.20000 1.516330 64.15 0.5352 40.000
50 ∞ (variable) 40.000
Image plane ∞

20th surface of aspherical data
K = -3.02619e + 001 A 4 = 2.24478e-005 A 6 = -2.99801e-007 A 8 = 7.08419e-009 A10 = -3.76526e-011 A12 = -1.80438e-013 A14 = 2.02751e-015 A16 =-9.51394e-018
A 3 = 5.77249e-006 A 5 = 2.58564e-006 A 7 = -6.13157e-008 A 9 = 3.93859e-010 A11 = -2.17157e-012 A13 = 1.39559e-014 A15 = 2.52043e-017

Various data Zoom ratio 17.30

Focal length 6.40 12.80 25.98 52.22 110.72
F number 1.87 1.87 1.87 1.88 3.00
Half angle of view 40.67 23.25 11.95 6.01 2.84
Image height 5.50 5.50 5.50 5.50 5.50
Lens total length 300.76 300.76 300.76 300.76 300.76
BF 8.02 8.02 8.02 8.02 8.02

d19 0.10 19.26 32.35 40.85 46.17
d26 46.41 24.67 10.03 3.23 5.86
d29 7.11 9.69 11.23 9.54 1.59
d50 8.02 8.02 8.02 8.02 8.02

Entrance pupil position 48.44 72.07 111.32 174.85 282.48
Exit pupil position 279.47 279.47 279.47 279.47 279.47
Front principal point position 54.99 85.48 139.79 237.13 438.36
Rear principal point position 1.62 -4.78 -17.96 -44.20 -102.70

Zoom lens group Data group Start surface Focal length Lens configuration length Front principal point position Posterior principal point position
1 1 45.60 88.98 52.67 17.24
2 20 -14.30 15.01 0.77 -11.12
3 27 -38.90 3.28 -0.10 -1.90
4 30 63.54 131.85 74.78 -143.34

(Numerical Example 5)
Unit mm
Surface number rd nd vd θgF Effective diameter Focal length
1 141.92131 4.17661 1.834000 37.16 0.5776 84.982 -95.486
2 50.53186 21.44256 70.617
3 -91.92930 2.10000 1.487490 70.23 0.5300 70.610 -120.000
4 163.59476 0.20000 68.908
5 70.63501 2.35291 1.772499 49.60 0.5520 68.975 931.868
6 77.13974 5.03492 68.350
7 132.39465 2.00000 1.805181 25.42 0.6161 68.224 -337.124
8 88.65467 2.56220 67.685
9 136.60328 12.68708 1.496999 81.54 0.5375 67.775 117.372
10 -99.17025 5.92168 68.443
11 71.36705 11.87971 1.438750 94.66 0.5340 69.937 133.991
12 -321.17560 0.12385 69.700
13 182.55258 3.12601 1.959060 17.47 0.6598 67.008 225.564
14 1082.15441 0.30000 66.765
15 80.54659 2.00000 1.755199 27.51 0.6103 62.474 -83.421
16 35.13830 13.18884 1.496999 81.54 0.5375 56.576 92.247
17 130.40642 0.15000 56.007
18 69.91995 6.58042 1.754999 52.32 0.5475 55.380 97.952
19 1140.27839 (variable) 54.796
20 48.23132 1.00000 1.903660 31.32 0.5946 21.921 -17.375
21 11.79444 6.03366 17.601
22 -26.03854 3.53836 1.922860 18.90 0.6495 17.359 26.358
23 -13.48705 0.75000 1.816000 46.62 0.5568 17.611 -13.168
24 55.56854 0.31317 17.840
25 26.55232 3.37032 1.575006 41.50 0.5767 18.285 36.224
26 -94.63213 (variable) 18.222
27 -26.90093 0.75000 1.772499 49.60 0.5520 18.788 -20.263
28 38.33100 2.53316 1.846660 23.78 0.6205 20.570 42.933
29 -841.45376 (variable) 21.010
30 (Aperture) ∞ 1.30000 26.645
31 3064.43332 4.47512 1.617722 49.81 0.5603 27.690 53.262
32 -33.39992 0.15000 28.287
33 124.91422 2.65616 1.517417 52.43 0.5564 29.033 150.781
34 -208.80121 0.15000 29.082
35 44.77096 6.56043 1.487490 70.23 0.5300 29.034 43.444
36 -38.50375 1.00000 1.834000 37.16 0.5776 28.717 -42.518
37 493.41848 36.00000 28.598
38 77.98861 4.07868 1.487490 70.23 0.5300 28.372 75.435
39 -68.83078 0.10000 28.207
40 74.28692 1.00000 1.834000 37.16 0.5776 27.068 -29.975
41 18.67856 7.80053 1.517417 52.43 0.5564 25.473 28.563
42 -62.02131 3.68424 25.548
43 -41.36183 2.77180 1.487490 70.23 0.5300 25.115 136.360
44 -26.09211 1.00000 1.816000 46.62 0.5568 25.282 -38.281
45 -157.10302 0.60000 26.352
46 51.38269 7.82352 1.496999 81.54 0.5375 27.530 42.129
47 -33.71503 4.50000 27.716
48 ∞ 33.00000 1.608590 46.44 0.5664 40.000
49 ∞ 13.20000 1.516330 64.15 0.5352 40.000
50 ∞ 0.00000 40.000

20th surface of aspherical data
K = -3.02619e + 001 A 4 = 2.24478e-005 A 6 = -2.99801e-007 A 8 = 7.08419e-009 A10 = -3.76526e-011 A12 = -1.80438e-013 A14 = 2.02751e-015 A16 =-9.51394e-018
A 3 = 5.77249e-006 A 5 = 2.58564e-006 A 7 = -6.13157e-008 A 9 = 3.93859e-010 A11 = -2.17157e-012 A13 = 1.39559e-014 A15 = 2.52043e-017

Various data Zoom ratio 17.30

Focal length 6.40 12.80 25.98 52.22 110.72
F number 1.87 1.87 1.87 1.88 3.00
Half angle of view 40.67 23.25 11.95 6.01 2.84
Image height 5.50 5.50 5.50 5.50 5.50
Lens total length 308.68 308.68 308.68 308.68 308.68
BF 8.02 8.02 8.02 8.02 8.02

d19 1.17 20.33 33.42 41.92 47.24
d26 46.41 24.67 10.03 3.23 5.86
d29 7.11 9.69 11.23 9.54 1.59
d50 8.02 8.02 8.02 8.02 8.02

Entrance pupil position 51.82 75.46 114.70 178.24 285.86
Exit pupil position 279.47 279.47 279.47 279.47 279.47
Front principal point position 58.37 88.86 143.17 240.51 441.74
Rear principal point position 1.62 -4.78 -17.96 -44.20 -102.70

Zoom lens group Data group Start surface Focal length Lens configuration length Front principal point position Posterior principal point position
1 1 45.60 95.83 56.05 18.31
2 20 -14.30 15.01 0.77 -11.12
3 27 -38.90 3.28 -0.10 -1.90
4 30 63.54 131.85 74.78 -143.34

(Numerical Example 6)
Unit mm
Surface number rd nd vd θgF Effective diameter Focal length
1 204.25216 4.17661 1.834000 37.16 0.5776 85.025 -76.705
2 48.49427 17.81306 69.638
3 -199.40523 2.10000 1.595220 67.74 0.5442 69.635 -176.394
4 224.28936 0.20000 68.738
5 78.15344 4.61515 1.922860 18.90 0.6495 68.745 215.095
6 124.24155 3.06759 68.099
7 181.20904 2.00000 1.854780 24.80 0.6122 67.567 -403.151
8 118.53729 1.12636 66.262
9 150.26367 10.96376 1.438750 94.66 0.5340 66.267 148.559
10 -113.04955 10.28549 66.497
11 108.61488 8.34049 1.433870 95.10 0.5373 63.990 181.843
12 -284.23707 0.14224 63.517
13 220.29684 3.10171 1.800000 29.84 0.6017 61.468 5000.000
14 231.56541 0.30000 60.293
15 80.79933 2.00000 1.728250 28.46 0.6077 58.440 -120.602
16 41.80724 13.88530 1.496999 81.54 0.5375 55.968 75.702
17 -344.50529 0.15000 55.707
18 65.42852 5.77432 1.788001 47.37 0.5559 53.740 104.341
19 301.97915 (variable) 53.102
20 * 48.23132 1.00000 1.903660 31.32 0.5946 21.916 -17.375
21 11.79444 6.03366 17.601
22 -26.03854 3.53836 1.922860 18.90 0.6495 17.361 26.358
23 -13.48705 0.75000 1.816000 46.62 0.5568 17.615 -13.168
24 55.56854 0.31317 17.851
25 26.55232 3.37032 1.575006 41.50 0.5767 18.300 36.224
26 -94.63213 (variable) 18.239
27 -26.90093 0.75000 1.772499 49.60 0.5520 18.788 -20.263
28 38.33100 2.53316 1.846660 23.78 0.6205 20.570 42.933
29 -841.45376 (variable) 21.010
30 (Aperture) ∞ 1.30000 26.644
31 3064.43332 4.47512 1.617722 49.81 0.5603 27.690 53.262
32 -33.39992 0.15000 28.287
33 124.91422 2.65616 1.517417 52.43 0.5564 29.033 150.781
34 -208.80121 0.15000 29.082
35 44.77096 6.56043 1.487490 70.23 0.5300 29.034 43.444
36 -38.50375 1.00000 1.834000 37.16 0.5776 28.717 -42.518
37 493.41848 36.00000 28.598
38 77.98861 4.07868 1.487490 70.23 0.5300 28.371 75.435
39 -68.83078 0.10000 28.206
40 74.28692 1.00000 1.834000 37.16 0.5776 27.068 -29.975
41 18.67856 7.80053 1.517417 52.43 0.5564 25.369 28.563
42 -62.02131 3.68424 25.447
43 -41.36183 2.77180 1.487490 70.23 0.5300 25.016 136.360
44 -26.09211 1.00000 1.816000 46.62 0.5568 25.184 -38.281
45 -157.10302 0.60000 26.243
46 51.38269 7.82352 1.496999 81.54 0.5375 27.408 42.129
47 -33.71503 4.50000 27.597
48 ∞ 33.00000 1.608590 46.44 0.5664 40.000
49 ∞ 13.20000 1.516330 64.15 0.5352 40.000
50 ∞ (variable) 40.000
Image plane ∞

20th surface of aspherical data
K = -3.02619e + 001 A 4 = 2.24478e-005 A 6 = -2.99801e-007 A 8 = 7.08419e-009 A10 = -3.76526e-011 A12 = -1.80438e-013 A14 = 2.02751e-015 A16 =-9.51394e-018
A 3 = 5.77249e-006 A 5 = 2.58564e-006 A 7 = -6.13157e-008 A 9 = 3.93859e-010 A11 = -2.17157e-012 A13 = 1.39559e-014 A15 = 2.52043e-017

Various data Zoom ratio 17.30

Focal length 6.40 12.80 25.98 52.22 110.72
F number 1.87 1.87 1.87 1.88 3.00
Half angle of view 40.67 23.25 11.95 6.01 2.84
Image height 5.50 5.50 5.50 5.50 5.50
Lens total length 301.82 301.82 301.82 301.82 301.82
BF 8.02 8.02 8.02 8.02 8.02

d19 0.10 19.26 32.35 40.85 46.17
d26 46.41 24.67 10.03 3.23 5.86
d29 7.11 9.69 11.23 9.54 1.59
d50 8.02 8.02 8.02 8.02 8.02

Entrance pupil position 49.28 72.92 112.16 175.70 283.32
Exit pupil position 279.47 279.47 279.47 279.47 279.47
Front principal point position 55.83 86.32 140.63 237.97 439.20
Rear principal point position 1.62 -4.78 -17.96 -44.20 -102.70

Zoom lens group Data group Start surface Focal length Lens configuration length Front principal point position Posterior principal point position
1 1 45.60 90.04 53.51 17.24
2 20 -14.30 15.01 0.77 -11.12
3 27 -38.90 3.28 -0.10 -1.90
4 30 63.54 131.85 74.78 -143.34

(Numerical Example 7)
Unit mm
Surface number rd nd vd θgF Effective diameter Focal length
1 200.52186 4.17661 1.834000 37.16 0.5776 84.988 -77.573
2 48.68262 18.42889 69.691
3 -164.44095 2.10000 1.487490 70.23 0.5300 69.687 -191.876
4 219.57025 0.20000 68.572
5 77.39663 3.54658 1.922860 18.90 0.6495 68.350 322.813
6 101.80993 5.27690 67.683
7 280.27044 2.00000 1.805181 25.42 0.6161 67.256 -188.204
8 98.63072 0.22657 66.974
9 100.67434 12.86323 1.496999 81.54 0.5375 67.057 112.484
10 -121.16586 5.17661 67.509
11 84.67144 11.25151 1.496999 81.54 0.5375 67.595 130.783
12 -270.79830 0.14993 66.996
13 145.61103 6.59480 1.922860 18.90 0.6495 63.725 120.000
14 -476.71385 0.30000 62.688
15 -649.67299 2.00000 1.755199 27.51 0.6103 61.914 -49.385
16 39.97977 13.52877 1.496999 81.54 0.5375 55.273 77.069
17 -871.13350 0.15000 55.168
18 59.74527 7.28895 1.772499 49.60 0.5520 54.378 82.745
19 810.53865 (variable) 53.790
20 * 48.23132 1.00000 1.903660 31.32 0.5946 21.915 -17.375
21 11.79444 6.03366 17.601
22 -26.03854 3.53836 1.922860 18.90 0.6495 17.361 26.358
23 -13.48705 0.75000 1.816000 46.62 0.5568 17.616 -13.168
24 55.56854 0.31317 17.852
25 26.55232 3.37032 1.575006 41.50 0.5767 18.301 36.224
26 -94.63213 (variable) 18.240
27 -26.90093 0.75000 1.772499 49.60 0.5520 18.788 -20.263
28 38.33100 2.53316 1.846660 23.78 0.6205 20.570 42.933
29 -841.45376 (variable) 21.010
30 (Aperture) ∞ 1.30000 26.644
31 3064.43332 4.47512 1.617722 49.81 0.5603 27.690 53.262
32 -33.39992 0.15000 28.287
33 124.91422 2.65616 1.517417 52.43 0.5564 29.033 150.781
34 -208.80121 0.15000 29.082
35 44.77096 6.56043 1.487490 70.23 0.5300 29.034 43.444
36 -38.50375 1.00000 1.834000 37.16 0.5776 28.717 -42.518
37 493.41848 36.00000 28.598
38 77.98861 4.07868 1.487490 70.23 0.5300 28.371 75.435
39 -68.83078 0.10000 28.206
40 74.28692 1.00000 1.834000 37.16 0.5776 27.068 -29.975
41 18.67856 7.80053 1.517417 52.43 0.5564 25.393 28.563
42 -62.02131 3.68424 25.470
43 -41.36183 2.77180 1.487490 70.23 0.5300 25.039 136.360
44 -26.09211 1.00000 1.816000 46.62 0.5568 25.207 -38.281
45 -157.10302 0.60000 26.270
46 51.38269 7.82352 1.496999 81.54 0.5375 27.438 42.129
47 -33.71503 4.50000 27.627
48 ∞ 33.00000 1.608590 46.44 0.5664 40.000
49 ∞ 13.20000 1.516330 64.15 0.5352 40.000
50 ∞ (variable) 40.000
Image plane ∞

20th surface of aspherical data
K = -3.02619e + 001 A 4 = 2.24478e-005 A 6 = -2.99801e-007 A 8 = 7.08419e-009 A10 = -3.76526e-011 A12 = -1.80438e-013 A14 = 2.02751e-015 A16 =-9.51394e-018
A 3 = 5.77249e-006 A 5 = 2.58564e-006 A 7 = -6.13157e-008 A 9 = 3.93859e-010 A11 = -2.17157e-012 A13 = 1.39559e-014 A15 = 2.52043e-017

Various data Zoom ratio 17.30

Focal length 6.40 12.80 25.98 52.22 110.72
F number 1.87 1.87 1.87 1.88 3.00
Half angle of view 40.67 23.25 11.95 6.01 2.84
Image height 5.50 5.50 5.50 5.50 5.50
Lens total length 307.04 307.04 307.04 307.04 307.04
BF 8.02 8.02 8.02 8.02 8.02

d19 0.10 19.26 32.35 40.85 46.17
d26 46.41 24.67 10.03 3.23 5.86
d29 7.11 9.69 11.23 9.54 1.59
d50 8.02 8.02 8.02 8.02 8.02

Entrance pupil position 49.52 73.15 112.39 175.93 283.55
Exit pupil position 279.47 279.47 279.47 279.47 279.47
Front principal point position 56.07 86.55 140.86 238.20 439.43
Rear principal point position 1.62 -4.78 -17.96 -44.20 -102.70

Zoom lens group Data group Start surface Focal length Lens configuration length Front principal point position Posterior principal point position
1 1 45.60 95.26 53.74 17.24
2 20 -14.30 15.01 0.77 -11.12
3 27 -38.90 3.28 -0.10 -1.90
4 30 63.54 131.85 74.78 -143.34

(Numerical Example 8)
Unit mm
Surface number rd nd vd θgF Effective diameter Focal length
1 502.66990 4.17661 1.834000 37.16 0.5776 85.047 -79.265
2 58.53044 16.86559 71.935
3 -145.48338 2.10000 1.618000 63.33 0.5441 71.937 -139.457
4 214.58771 0.20000 71.480
5 89.57371 3.93930 1.922860 18.90 0.6495 72.118 297.153
6 129.43046 2.96368 71.624
7 181.74842 2.00000 1.805181 25.42 0.6161 71.417 -220.296
8 89.74239 0.56259 69.985
9 95.93195 15.71103 1.496999 81.54 0.5375 70.001 96.907
10 -91.99175 11.12364 69.738
11 98.04867 7.91220 1.496999 81.54 0.5375 62.720 157.494
12 -383.24690 0.12020 62.715
13 105.37429 3.48238 1.808095 22.76 0.6307 62.209 301.809
14 181.37119 0.30000 61.750
15 71.61742 2.00000 1.755199 27.51 0.6103 60.452 -118.278
16 39.41732 13.29035 1.496999 81.54 0.5375 56.407 87.181
17 376.56668 0.15000 55.574
18 80.49402 4.60417 1.772499 49.60 0.5520 53.908 153.837
19 240.81522 (variable) 53.113
20 46.77190 1.00000 1.903660 31.32 0.5946 21.791 -17.829
21 11.92789 6.06434 17.574
22 -23.36350 3.52331 1.922860 18.90 0.6495 17.340 26.778
23 -12.96130 0.75000 1.816000 46.62 0.5568 17.637 -12.758
24 55.71183 0.31317 17.990
25 28.14757 3.53106 1.575006 41.50 0.5767 18.461 33.975
26 -62.06863 (variable) 18.452
27 -26.54588 0.75000 1.772499 49.60 0.5520 18.883 -20.291
28 39.20474 2.72698 1.846660 23.78 0.6205 20.695 43.226
29 -624.72572 (variable) 21.218
30 (Aperture) ∞ 1.30000 26.559
31 -1925.64395 5.16940 1.617722 49.81 0.5603 27.542 54.014
32 -32.98509 0.15000 28.475
33 81.28116 3.32523 1.517417 52.43 0.5564 29.346 103.318
34 -156.04622 0.15000 29.339
35 53.91507 6.74087 1.487490 70.23 0.5300 29.035 47.865
36 -39.68463 1.00000 1.834000 37.16 0.5776 28.502 -41.992
37 318.66444 (variable) 28.294
38 89.61184 3.57419 1.517417 52.43 0.5564 27.486 88.673
39 -93.60189 0.19988 27.304
40 45.79275 1.00000 1.882997 40.76 0.5667 26.609 -37.257
41 19.01190 4.16812 1.496999 81.54 0.5375 25.260 86.238
42 31.60282 2.76677 25.242
43 31.44278 8.63738 1.487490 70.23 0.5300 26.647 31.380
44 -27.28265 1.00000 1.882997 40.76 0.5667 26.590 -35.801
45 -195.48929 0.60195 27.427
46 88.18676 6.36034 1.487490 70.23 0.5300 28.029 49.259
47 -32.36757 4.50000 28.178
48 ∞ 33.00000 1.608590 46.44 0.5664 40.000
49 ∞ 13.20000 1.516330 64.15 0.5352 40.000
50 ∞ (variable) 40.000
Image plane ∞

20th surface of aspherical data
K = -3.25693e + 000 A 4 = -2.07343e-005 A 6 = -1.25311e-006 A 8 = 1.00881e-007 A10 = -1.28429e-010 A12 = 2.81194e-012 A14 = -3.27264e-014 A16 = -2.37382e-016
A 3 = 2.35118e-005 A 5 = 9.15941e-006 A 7 = -2.45164e-007 A 9 = -1.06120e-008 A11 = 7.05616e-011 A13 = -6.39259e-013 A15 = 6.91970e-015

Various data Zoom ratio 17.30

Focal length 6.54 13.21 26.80 52.20 113.09
F number 1.87 1.87 1.87 1.88 3.00
Half angle of view 40.08 22.61 11.60 6.02 2.78
Image height 5.50 5.50 5.50 5.50 5.50
Lens total length 305.86 305.86 305.86 305.86 305.86
BF 7.99 7.99 7.99 7.99 7.99

d19 0.96 19.37 33.63 42.43 48.14
d26 47.20 21.10 7.99 3.00 5.13
d29 6.70 9.99 11.34 9.45 1.57
d37 36.00 40.40 37.89 35.98 36.01
d50 7.99 7.99 7.99 7.99 7.99

Entrance pupil position 49.31 71.75 113.78 181.21 297.68
Exit pupil position 240.02 176.35 207.43 240.43 239.73
Front principal point position 56.03 85.99 144.19 245.13 465.96
Rear principal point position 1.46 -5.21 -18.81 -44.20 -105.09

Zoom lens group Data group Start surface Focal length Lens configuration length Front principal point position Posterior principal point position
1 1 47.80 91.50 52.74 17.20
2 20 -14.46 15.18 0.69 -11.54
3 27 -38.81 3.48 -0.13 -2.03
4 30 36.05 17.84 2.76 -8.73
5 38 51.25 79.01 14.98 -40.72

(Numerical Example 9)
Unit mm
Surface number rd nd vd θgF Effective diameter Focal length
1 983.79063 4.17661 1.834000 37.16 0.5776 85.045 -81.378
2 63.74446 15.85044 72.763
3 -150.74735 2.10000 1.618000 63.33 0.5441 72.766 -140.008
4 205.99319 0.20000 72.150 0.000
5 89.36076 3.65416 1.922860 18.90 0.6495 72.713 341.859
6 121.62364 2.97942 72.205
7 165.80455 2.00000 1.805181 25.42 0.6161 72.023 -235.743
8 88.39960 0.80214 70.581
9 97.33154 15.78724 1.496999 81.54 0.5375 70.599 97.975
10 -92.72714 10.96125 70.342
11 95.59247 8.05772 1.496999 81.54 0.5375 61.782 149.575
12 -329.30522 0.12078 61.774
13 107.21904 3.41380 1.808095 22.76 0.6307 61.161 301.735
14 187.13054 0.30000 60.701
15 66.38875 2.00000 1.755199 27.51 0.6103 59.200 -124.654
16 38.56102 12.57190 1.496999 81.54 0.5375 55.216 89.796
17 248.26323 0.15000 54.289
18 80.49402 4.15622 1.772499 49.60 0.5520 52.834 172.325
19 197.57315 (variable) 52.034
20 41.53289 1.00000 1.903660 31.32 0.5946 22.136 -18.571
21 11.87861 6.11857 17.788
22 -25.15009 3.56636 1.922860 18.90 0.6495 17.521 26.345
23 -13.29162 0.75000 1.816000 46.62 0.5568 17.731 -12.621
24 47.98992 (variable) 17.823
25 29.34261 3.41911 1.575006 41.50 0.5767 18.958 37.556
26 -80.01266 (variable) 18.913
27 -24.19489 0.75000 1.772499 49.60 0.5520 18.910 -21.116
28 51.50170 2.71711 1.846660 23.78 0.6205 20.749 43.705
29 -132.87220 (variable) 21.305
30 (Aperture) ∞ 1.30000 25.843
31 -268.62319 4.38051 1.617722 49.81 0.5603 26.541 66.045
32 -35.78724 0.15000 27.463
33 224.51855 3.95994 1.517417 52.43 0.5564 28.310 75.053
34 -46.92842 0.15000 28.469
35 50.93393 6.71178 1.487490 70.23 0.5300 27.844 44.452
36 -36.29783 1.00000 1.834000 37.16 0.5776 27.245 -37.245
37 228.09008 (variable) 26.977

38 67.53268 3.39270 1.517417 52.43 0.5564 26.752 92.089
39 -161.52426 1.88498 26.728
40 75.88895 1.00000 1.882997 40.76 0.5667 26.333 -31.475
41 20.30272 3.74952 1.496999 81.54 0.5375 25.371 107.664
42 30.65140 1.11516 25.640
43 31.47164 9.08151 1.487490 70.23 0.5300 26.583 30.249
44 -25.27784 1.00000 1.882997 40.76 0.5667 26.878 -45.808
45 -67.99343 0.60019 28.088
46 78.64301 6.81174 1.487490 70.23 0.5300 29.106 48.290
47 -32.80080 4.50000 29.250
48 ∞ 33.00000 1.608590 46.44 0.5664 40.000
49 ∞ 13.20000 1.516330 64.15 0.5352 40.000
50 ∞ (variable) 40.000
Image plane ∞

20th surface of aspherical data
K = -1.43681e + 000 A 4 = -2.01627e-005 A 6 = -1.72199e-006 A 8 = 7.87700e-008 A10 = -1.02182e-010 A12 = 3.23331e-012 A14 = -3.79970e-014 A16 = -2.25937e-016
A 3 = 2.05055e-005 A 5 = 9.69482e-006 A 7 = -9.96661e-008 A 9 = -9.06636e-009 A11 = 5.79640e-011 A13 = -5.68391e-013 A15 = 6.83389e-015

Various data Zoom ratio 17.30

Focal length 6.52 13.21 26.00 52.20 112.87
F number 1.87 1.88 1.88 1.88 3.00
Half angle of view 40.13 22.60 11.94 6.01 2.79
Image height 5.50 5.50 5.50 5.50 5.50
Lens total length 306.00 306.00 306.00 306.00 306.00
BF 8.00 8.00 8.00 8.00 8.00

d19 0.96 19.04 33.82 43.44 48.92
d24 2.46 1.99 1.67 1.53 1.04
d26 48.10 17.99 6.70 3.35 3.00
d29 5.89 10.22 11.58 9.11 1.58
d37 36.00 44.18 39.64 35.98 38.88
d50 8.00 8.00 8.00 8.00 8.00

Entrance pupil position 49.21 71.04 114.56 194.27 300.07
Exit pupil position 165.53 112.60 136.46 165.70 141.60
Front principal point position 56.00 85.92 145.82 263.75 508.29
Rear principal point position 1.48 -5.21 -18.00 -44.20 -104.87

Zoom lens group Data group Start surface Focal length Lens configuration length Front principal point position Posterior principal point position
1 1 49.20 89.28 52.17 16.77
2 20 -8.60 11.43 3.30 -4.68
3 25 37.56 3.42 0.59 -1.60
4 27 -42.16 3.47 -0.54 -2.46
5 30 37.28 17.65 2.79 -8.56
6 38 49.25 79.34 17.37 -38.23

U1: 1st lens group U11: 1st sub lens group U12: 2nd sub lens group U13: 3rd sub lens group U2: 2nd lens group U3: 3rd lens group U4: 4th lens group (1-7th) Example: final lens group)
U5: 5th lens group (8th embodiment: final lens group)
U6: 6th lens group (9th embodiment: final lens group)

Claims (6)

From the object side to the image side, the first lens group having a positive refractive power that does not move for scaling, and the scaling of one of two or four groups that move for scaling respectively. A zoom lens composed of a lens group and a lens group having a positive refractive power that does not move due to scaling.
The first lens group moves from the object side to the image side in order from the first sub-lens group having a negative refractive force and not moving for focusing, and the first sublens group having a positive refractive force and moving for focusing. It consists of a second sub-lens group that has a positive refractive power and a third sub-lens group that does not move for focusing, and has a negative refractive power among the lenses constituting the first sub-lens group. The number of abbets of the lens having the largest number of abbreviations is νn11, the partial dispersion ratio of the lens is set to θn11, and the number of abbreviations is the smallest among the lenses constituting the third sublens group. When the Abbe number of the lens is νp13 and the partial dispersion ratio of the lens is θp13,
2.00 <νn11 / νp13
θn11 / θp13 <0.91
A zoom lens characterized by satisfying the conditional expression.
However, the refractive index on the g-line is Ng, the refractive index on the C-line is NC, the refractive index on the d-line is Nd, the refractive index on the F-line is NF, and the Abbe number ν and the partial dispersion ratio θ are ν, respectively. = (Nd-1) / (NF-NC) and θ = (Ng-NF) / (NF-NC)
It shall be represented by. The refractive power at the wide-angle end of the zoom lens is φw, the refractive power of the first lens group is φ1, and νn11 is excluded from the Abbe numbers of the lenses having a negative refractive power constituting the first lens group. Let the average Abbe number be νan
-0.20 <(1 / νn11-1 / νan) / (φ1 / φw) <-0.05
The zoom lens according to claim 1, wherein the zoom lens satisfies the conditional expression. The refractive power of the zoom lens at the telephoto end is φt, the refractive power of the first lens group is φ1, and νp13 is excluded from the Abbe numbers of the lenses having a positive refractive power constituting the first lens group. Let the average Abbe number be νap,
0.005 <(1 / νp13-1 / νap) / (φ1 / φt) <0.020
The zoom lens according to claim 1 or 2, wherein the zoom lens satisfies the conditional expression. The refractive power of the first lens group is φ1, and the refractive power of the lens having a negative refractive power and having the largest Abbe number among the lenses constituting the first sub-lens group is φn11.
-0.40 <φn11 / φ1 <-0.15
The zoom lens according to any one of claims 1 to 3, wherein the zoom lens satisfies the conditional expression. The refractive power of the first lens group is φ1, and the refractive power of the lens having a positive refractive power and the smallest Abbe number among the lenses constituting the third sub-lens group is φp13.
0.005 <φp13 / φ1 <0.400
The zoom lens according to any one of claims 1 to 4, wherein the zoom lens satisfies the conditional expression. An image pickup apparatus comprising the zoom lens according to any one of claims 1 to 5 and an image pickup element that receives an image formed by the zoom lens.

Images