DE1772665C - Lens with a relatively large focal length on the image side in relation to its focal length - Google Patents

Description

This group of effects are preferably hollow objects and the focal point of this group of effects
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In> ien five tables of claims 2 to 6 are indicated several objectives according to the invention with their dills.

1 to 5 stollen axial sections of this Lenses are. Furthermore, in Figs. La to 5a the correction curves Rir given for these lenses. The F i g. 6 shows a compilation of these five Lenses, at the same time the individual focal lengths for the three action groups that make up the lenses exist, as well as the total focal lengths of the action groups in front of the aperture are given are.

From the compilation in FIG. 6 it is clear that the objectives according to the invention are still another Have a number of other common design features. The effect in front of the diaphragm

Group with negative refractive power preferably exclusively has hollow refractive surfaces only for the aperture on. The area of the action group with negative refractive power and immediately following the diaphragm the surface on the image side is hollow. Their radii of curvature are smaller than the total focal length. The total focal length of the negative effect group on the object side is taken absolutely greater than the total focal length of the lens, and

ίο the focal length of the action group in front of the diaphragm with positive refractive power is smaller than the total focal length of the lens.

With lenses of this type, there is a back focal length on the image side that is about two thirds of the Total focal length of the lens or greater.

The performance of the new design principle can be seen from the angles of view given in the tables of the claims. Even at Ver turn of only four lenses an aperture ratio voi 1 is at an angle of ± 15 ^C: 4 achievable.

For this purpose 3 sheets of drawings

209 t

Claims (1)

772 665 Patent claims: 1. ObjekHv with in relation to its focal length Relatively large focal length on the image side and high aperture, in particular a wide-angle lens, thereby marked that a) seen in the direction of light, a first negative effect group from at least one to Aperture has a hollow meniscus, the focal length of which is between - 1.170./ and - 1.608./, b) on the first negative action group in front of the diaphragm, preferably one of at least two lenses of opposite refractive power cemented action group with positive refractive power folate. whose focal length is between + 0.694./* and + 0.740. /. c) the air gap between the first negative impact group and the following one Efficacy soup with positive refractive power is between 0.439./ and 0.712./. d) the width of the aperture between 0.048. / and 0.104./ is and e) behind the diaphragm an action group λ consisting of at least one lens with a negative one Refractive power is arranged. The lenses of this group of effects are preferably hollow menisci for the diaphragm and the The focal length of this group of effects is between -1.069./ and -7.900./. 2. Lens according to claim 1, characterized by the following data: Focal length: 100: Angle of view: ± 19.5; Focal ratio: 1: 4. + 73.20 4 = 4.97 1 / l = ! 50.4 - 106.9 { + 42.85 ^a i = 66.20 j + 38.50 <- ', = 51.95 fl = + 59.9 -26.28 ds = 11.92 -153. j a ₂₁ = 1.65 31end space a ₂₂ = 3.19 j ■ 1 -22.36 d, = 4.47 1 / 3 - -33.90 /1.2 - + ⁵⁶ - ² = 72.8 3. Lens according to claim 1, characterized by the following data: Focal length: 100: Angle of view: ± il ^c : Focal ratio: 1: 4. ^ T - t \ - + 99.80 dy = 5.94 1.76256 31.58 + 53.61 Cl _x = 71.20 + 48.17 cl ₂ = 48.95 1.67133 41.64 -58.18 d ₃ = 27.70 1.76859 26.31 -204.5 a _2s = 1.71 • Blenders aum H ₂₂ = 5.72 - 22.80 'U = 2.36 1.62408 36.11 + 214.0 «/, = 4.64 1.56181 60.96 -27.79 '■ = -160.8 f ₂ = +69.4 /, = -203.0 = 74.7 3 '4 4. Lens according to claim 1, characterized by the following data: focal length: 100: angle of view: = 37: ÖfTnunasverbindi.is: 1: 2.8. Ί = -t- Vö. ΙΊ J ₁ = + 94.39 J ₁ = 5.43 1.62286 60.0S f \ ⁼ August 60 1: 2.8. -! 26.5 r-, = + 61.20 η, = + 63.17 «1 = 9.86 ^Γ ι = + 101.6 J, = + 116.93 d-, = 5.43 1.62286 August 60 6C.08 / 1 = Ι'λ = + 60.75 + 64.63 Cl ₁ = 5'.20 ^r 5 ⁼ + 60.10 ■ fz = -γ71.4 ₍ / _{3 =} + 59.67 '/ 3 = 30.72 1.79227 47.15 47.15 r "= ■ 91.20 J ₄ = -99.37 ,; _ 17.61 i.fc 1 -: uj 25.24 25.24 / ■ - = -549.3 > L = «3! = -1422.18 «31 = 2.14] Aperture space Cl ₂ - = «32 = 8.35 ί '"s = -56.39 J- = -51.20 J ₅ = 11.29 1.62286 August 60 August 60 '' u = -71.58 CIj. - -62.40 Ct ₄ = 2.34 'Vi = + 3330.0 / 3 = -3'6.Ο dt, = + 1550.45 dt, = 13.61 1.72823 37.85 37.85 'Ίι = -36.08 J- = - 36.06 J-. = 6:00 am 1.81265 25.24 25.24 j · ,, = -100.5 ■ fs - «5 = -99.05 (I =, = 13.61 'Ή ⁼ -34.62 J ₈ = -35.52 J ₈ = 5.43 1.62408 36.11 36 11 '"14 = -61.00 following data: s' = -6:, 25 .s' = 65.70 Focal ratio: 5. Lens according to claim 1. ί ^ denotes by Focal length: 100: angle of view : ± 40: 1.62286 'Ί = 5.44 -134.4 ι ·, = 19.88 1.62286 r, = 5.44 C ₄ = 51.16 1.79227 ¹ 5 + 74.0 30.72 1.81265 '' h = 17.56 '' Τ = Aperture space 2.12 1 I. 8.30 yrs 1.62286 's = 11.28 j- " -. 2.32 1.72823 'Ίο = - 672.8 13.6 1.81265 'Ίι = 6.0 'Ί2 = 13.6 1.62408 > \ i = 5.44 '"u = 64.64 /i.2 = 6. Lens according to claim I. characterized by the following data: Focal length: KX): Angle of view: t 45: aperture ratio: 1: 3.4. 'Ί - + y «.. i '/. = 5.0 1.59263 40.66 ./, = -117.0 44.49 fi = +69.8 46.88 h = -790.0 '' ι ~~~ + 61.23 "l = 18.3 26.74 ^r 3 = + 133.3 d ₂ = 5.0 1.59263 40.66 4 /, 92 »4 = + 63.27 a ₂ = 47.2 26.74 ^r 5 = + 52.00 d ₃ = 28.3 1.74795 r _b = -180.3 <t » = 16.2 1.76847 60.96 ± X 031 = 2.85 } Aperture space 132 = 6.74 y ^r 8 = -46.08 Cl ₅ = 10.4 1.56295 r ₉ = -61.23 a ₄ = 2.17 ^r io = -1365.0 d _b = 12.5 1.68585 η ι = -26.83 dn = 5.6 1.76847 ^r 12 = -81.37 U ₅ = 12.5 ^r l3 = -32.98 d ₈ = 5.0 1.56181 ^r l4 = -49.65 S = 73.9 Ά.ι = +83.4 The invention relates to lenses, in particular wide-angle lenses, with a large focal length on the image side and high opening. The use of wide-angle lenses in single-lens reflex cameras is known for this makes it difficult that for purely mechanical reasons relatively due to the space required for the folding mirror large focal lengths on the image side are required. It has therefore been suggested such wide-angle lenses as inverted telephoto lenses, so-called retrofocus lenses. build up. However, this type of lens is particularly useful for color correction with regard to transverse deviations considerable difficulties. In addition, this type is only proportionate small openings too. if you don't want to get oversized designs. Another suggestion is to build these lenses as lenses that are almost symmetrical to the aperture, in those on both sides of the diaphragm positive members and at a clear distance therefrom on both Side negative limbs, preferably negative menisci, are arranged. This guy offers good ones Correction options, but only very short back focal lengths are achievable, especially for the type make unsuitable for SLR cameras. An increase in back focus is only possible Opening costs possible. The invention relates to lenses which do not have these disadvantages and even if they consist of a relatively large number of individual lenses. are cheap to manufacture. This is the case with a lens with a relatively large focal length on the image side and a high aperture in relation to its focal length. into the- special wide-angle lens, achieved according to the invention in that Seen in the direction of light, there is a first negative impact group made up of at least one "zui" Aperture has a hollow meniscus, the focal length of which is between -1.170. / And -1.608./. on the first negative impact group before de; Aperture a preferably of at least two Lenses of opposite refractive power cemented action group with positive refractive power folst whose focal length is between + 0.694. / unc + 0.740./, the air gap between the first negative impact group and the following we Action group with positive refractive power between 0.439./ and 0.712. / Hegt, the width of the aperture between 0.048.J. and 0.104./ is and behind the cover one of at least one. Lens existing impact group with neea tiver refractive power is arranged. being the lenser