GB595422A - Photographic objectives corrected spherically, astigmatically and for coma for one or more colours - Google Patents

Photographic objectives corrected spherically, astigmatically and for coma for one or more colours

Info

Publication number
GB595422A
GB595422A GB3648/45A GB364845A GB595422A GB 595422 A GB595422 A GB 595422A GB 3648/45 A GB3648/45 A GB 3648/45A GB 364845 A GB364845 A GB 364845A GB 595422 A GB595422 A GB 595422A
Authority
GB
United Kingdom
Prior art keywords
lens
doublet
converging
lenses
coma
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
GB3648/45A
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.)
Leica Aarau AG
Original Assignee
Kern and Co 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 Kern and Co AG filed Critical Kern and Co AG
Publication of GB595422A publication Critical patent/GB595422A/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

595,422. Photographic objectives. KERN & CO., Ltd. Feb. 14, 1945, No. 3648. Convention date, March 13, 1944. [Class 97 (i)] An objective corrected for spherical aberration, astigmatism and coma for one or more colours comprises as shown converging lenses L1, L2, a diverging doublet made up of lenses L3, L4 and a converging lens L5, the components being air separated and the lens L3 being a converging lens with a refractive index of at least 1.72 and an AbbÚ number greater by at least 4.0 than that of the diverging lens L4. The curvature of the cemented surface of the doublet is greater than that of its front surface, while the difference in the refractive indices of the lenses L2, L4 may be at least 0.07 ; the lens L4 may have a refractive index greater than that of the lens L2 but less than 1.70. One of the converging components, e.g. the second component L2, may be a doublet comprises lenses, the refractive indices of which differ by not more than 0.01 ; the front lens of this doublet may be diverging and may have a smaller AbbÚ number than the rear converging lens of the doublet. Optical data for one example are given.
GB3648/45A 1944-03-13 1945-02-14 Photographic objectives corrected spherically, astigmatically and for coma for one or more colours Expired GB595422A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH595422X 1944-03-13

Publications (1)

Publication Number Publication Date
GB595422A true GB595422A (en) 1947-12-04

Family

ID=4522400

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3648/45A Expired GB595422A (en) 1944-03-13 1945-02-14 Photographic objectives corrected spherically, astigmatically and for coma for one or more colours

Country Status (1)

Country Link
GB (1) GB595422A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2601367A (en) * 1949-05-26 1952-06-24 Taylor Taylor & Hobson Ltd Four-component optical objectives
US4057330A (en) * 1973-10-05 1977-11-08 Nippon Kogaku K.K. Lens system having large relative aperture and long focus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2601367A (en) * 1949-05-26 1952-06-24 Taylor Taylor & Hobson Ltd Four-component optical objectives
US4057330A (en) * 1973-10-05 1977-11-08 Nippon Kogaku K.K. Lens system having large relative aperture and long focus

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