GB487712A - Improvements in photographic objectives - Google Patents

Improvements in photographic objectives

Info

Publication number
GB487712A
GB487712A GB9545/37A GB954537A GB487712A GB 487712 A GB487712 A GB 487712A GB 9545/37 A GB9545/37 A GB 9545/37A GB 954537 A GB954537 A GB 954537A GB 487712 A GB487712 A GB 487712A
Authority
GB
United Kingdom
Prior art keywords
meniscus
menisci
april
nearly
refractive index
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
GB9545/37A
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.)
Carl Zeiss AG
Original Assignee
Carl Zeiss 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 Carl Zeiss AG filed Critical Carl Zeiss AG
Publication of GB487712A publication Critical patent/GB487712A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/04—Reversed telephoto objectives

Landscapes

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

Abstract

487,712. Lenses. ZEISS, C., [Firm of]. April 5, 1937, No. 9545. Convention date, April 9, 1936. [Class .97 (i)] In a photographic objective consisting of two menisci bounded by air, the rear meniscus being convergent, the convex surfaces of the menisci face each other, the focal length of the rear meniscus does not differ from that of the entire system by more than one-third of the latter length, and the ratio of the radii of curvature of the two air-bounded surfaces of the rear meniscus approaches more nearly to unity than does the corresponding ratio for the front meniscus. The rear meniscus is a triplet consisting of a divergent lens cemented between two convergent lenses, the refractive index of the front element being greater than that of the medial element, and still greater than that of the rear element. The front meniscus may also be a cemented triplet, the refractive index of the medial element being less than that of either of the outer elements. An additional element, having nearly the form of a parallel plate, may, as shown, be placed behind the rear meniscus. Data are given for two examples.
GB9545/37A 1936-04-09 1937-04-05 Improvements in photographic objectives Expired GB487712A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE487712X 1936-04-09

Publications (1)

Publication Number Publication Date
GB487712A true GB487712A (en) 1938-06-24

Family

ID=6543674

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9545/37A Expired GB487712A (en) 1936-04-09 1937-04-05 Improvements in photographic objectives

Country Status (1)

Country Link
GB (1) GB487712A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103748496A (en) * 2011-08-25 2014-04-23 富士胶片株式会社 Image pickup lens and image pickup apparatus using same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103748496A (en) * 2011-08-25 2014-04-23 富士胶片株式会社 Image pickup lens and image pickup apparatus using same

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