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GB237861A - Photographic lens - Google Patents

Photographic lens

Info

Publication number
GB237861A
GB237861A GB7189/25A GB718925A GB237861A GB 237861 A GB237861 A GB 237861A GB 7189/25 A GB7189/25 A GB 7189/25A GB 718925 A GB718925 A GB 718925A GB 237861 A GB237861 A GB 237861A
Authority
GB
United Kingdom
Prior art keywords
lenses
photographic lens
cemented
ernemann
chromatism
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB7189/25A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ernemann Werke AG
Original Assignee
Ernemann Werke AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ernemann Werke AG filed Critical Ernemann Werke AG
Publication of GB237861A publication Critical patent/GB237861A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/34—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having four components only

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

237,861. Ernemann-Werke Akt.-Ges. July 29, 1924, [Convention date]. Addition to 237,212. Lenses. - Photographic lenses according to the parent Specification are modified so that a cemented surface under corrected for chromatism is contained. The correction for zonal spherical aberration consequent upon this modification is effected by making the lenses forming the cemented doublet of glasses with a slight difference in refractive index.
GB7189/25A 1924-07-29 1925-03-17 Photographic lens Expired GB237861A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE237861X 1924-07-29

Publications (1)

Publication Number Publication Date
GB237861A true GB237861A (en) 1926-02-11

Family

ID=5903313

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7189/25A Expired GB237861A (en) 1924-07-29 1925-03-17 Photographic lens

Country Status (1)

Country Link
GB (1) GB237861A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2416443A (en) * 1943-04-23 1947-02-25 Polaroid Corp Optical system
US2600208A (en) * 1949-07-14 1952-06-10 Taylor Taylor & Hobson Ltd Four component objectives with second component a convergent cemented doublet having a dispersive internal contact surface
CZ305522B6 (en) * 2014-09-26 2015-11-11 Pramacom-Ht, Spol. S R.O. Objective

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2416443A (en) * 1943-04-23 1947-02-25 Polaroid Corp Optical system
US2600208A (en) * 1949-07-14 1952-06-10 Taylor Taylor & Hobson Ltd Four component objectives with second component a convergent cemented doublet having a dispersive internal contact surface
CZ305522B6 (en) * 2014-09-26 2015-11-11 Pramacom-Ht, Spol. S R.O. Objective

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