GB492311A - Improvements in and relating to objectives for photographic purposes - Google Patents

Improvements in and relating to objectives for photographic purposes

Info

Publication number
GB492311A
GB492311A GB808237A GB808237A GB492311A GB 492311 A GB492311 A GB 492311A GB 808237 A GB808237 A GB 808237A GB 808237 A GB808237 A GB 808237A GB 492311 A GB492311 A GB 492311A
Authority
GB
United Kingdom
Prior art keywords
focal length
objective
objectives
relating
components
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
GB808237A
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.)
Kapella Ltd
Original Assignee
Kapella Ltd
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 Kapella Ltd filed Critical Kapella Ltd
Priority to GB808237A priority Critical patent/GB492311A/en
Publication of GB492311A publication Critical patent/GB492311A/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
    • G02B13/02—Telephoto objectives, i.e. systems of the type + - in which the distance from the front vertex to the image plane is less than the equivalent focal length

Landscapes

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

Abstract

492,311. Lenses. WARMISHAM, A., WYNNE, C. G., and KAPELLA, Ltd. March 19, 1937, No. 8082. [Class 97 (i)] A telephoto objective comprises three compound components separated by air spaces, the front and middle components being convergent and the rear component divergent, and the air space between the two convergent components being greater than half the focal length of the objective. Preferably each component is approximately self-corrected chromatically, and the back focal length is less than a quarter of the focal length of the objective. Data are given for the example shown, having an aperture F/1-65 and back focal length À14F.
GB808237A 1937-03-19 1937-03-19 Improvements in and relating to objectives for photographic purposes Expired GB492311A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB808237A GB492311A (en) 1937-03-19 1937-03-19 Improvements in and relating to objectives for photographic purposes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB808237A GB492311A (en) 1937-03-19 1937-03-19 Improvements in and relating to objectives for photographic purposes

Publications (1)

Publication Number Publication Date
GB492311A true GB492311A (en) 1938-09-19

Family

ID=9845404

Family Applications (1)

Application Number Title Priority Date Filing Date
GB808237A Expired GB492311A (en) 1937-03-19 1937-03-19 Improvements in and relating to objectives for photographic purposes

Country Status (1)

Country Link
GB (1) GB492311A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2833181A (en) * 1955-11-02 1958-05-06 Bertele Ludwig Telephoto objective

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2833181A (en) * 1955-11-02 1958-05-06 Bertele Ludwig Telephoto objective

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