GB878879A - Improvements relating to wide angle lenses - Google Patents

Improvements relating to wide angle lenses

Info

Publication number
GB878879A
GB878879A GB191659A GB191659A GB878879A GB 878879 A GB878879 A GB 878879A GB 191659 A GB191659 A GB 191659A GB 191659 A GB191659 A GB 191659A GB 878879 A GB878879 A GB 878879A
Authority
GB
United Kingdom
Prior art keywords
menisci
divergent
central portion
wide angle
aperture stop
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
GB191659A
Inventor
Charles Gorrie Wynne
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.)
WRAY DEVELOPMENTS Ltd
Original Assignee
WRAY DEVELOPMENTS 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 WRAY DEVELOPMENTS Ltd filed Critical WRAY DEVELOPMENTS Ltd
Priority to GB191659A priority Critical patent/GB878879A/en
Publication of GB878879A publication Critical patent/GB878879A/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

878,879. Optical objectives. WRAY (DEVELOPMENTS) Ltd. April 14, 1960 [Jan. 19, 1959], No. 1916/59. Class 97(1) A wide angle objective consists of a central portion made up of two divergent menisci arranged concave to one another on opposite sides of an aperture stop and disposed between two convergent lenses, this central portion being arranged between two divergent menisci each concave towards the aperture stop. The convergent lenses of the central portion may be menisci, concave towards the aperture stop and each of the four components of the central portion may consist of a single element or of a cemented combination. Preferably, the front and rear divergent menisci are simple elements having refractive indices higher than 1À65. The convex front surface of the front divergent meniscus preferably has a radius of curvature greater than 1À5F where F is the equivalent focal length of the wide angle objective, and the inner concave surface of this meniscus is preferably of a radius greater then 0À7F. Optical data are given in the Specification for one example of the embodiment illustrated and for one example of an embodiment in which the lenses 3 and 7 are simple elements. Specification 689,916 is referred to.
GB191659A 1959-01-19 1959-01-19 Improvements relating to wide angle lenses Expired GB878879A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB191659A GB878879A (en) 1959-01-19 1959-01-19 Improvements relating to wide angle lenses

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB191659A GB878879A (en) 1959-01-19 1959-01-19 Improvements relating to wide angle lenses

Publications (1)

Publication Number Publication Date
GB878879A true GB878879A (en) 1961-10-04

Family

ID=9730272

Family Applications (1)

Application Number Title Priority Date Filing Date
GB191659A Expired GB878879A (en) 1959-01-19 1959-01-19 Improvements relating to wide angle lenses

Country Status (1)

Country Link
GB (1) GB878879A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3591257A (en) * 1968-06-15 1971-07-06 Leitz Ernst Gmbh Objective having long back focal distance with regard to its focal length

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3591257A (en) * 1968-06-15 1971-07-06 Leitz Ernst Gmbh Objective having long back focal distance with regard to its focal length

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