GB765413A - Improvements in or relating to photographic objectives - Google Patents

Improvements in or relating to photographic objectives

Info

Publication number
GB765413A
GB765413A GB5835/55A GB583555A GB765413A GB 765413 A GB765413 A GB 765413A GB 5835/55 A GB5835/55 A GB 5835/55A GB 583555 A GB583555 A GB 583555A GB 765413 A GB765413 A GB 765413A
Authority
GB
United Kingdom
Prior art keywords
component
objective
convergent
relating
photographic objectives
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
GB5835/55A
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.)
Paillard SA
Original Assignee
Paillard SA
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 Paillard SA filed Critical Paillard SA
Publication of GB765413A publication Critical patent/GB765413A/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

Landscapes

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

Abstract

765,413. Photographic objectives. PAILLARD SOC. ANON. Feb. 28, 1955 [May 5, 1954], No. 5835/55. Class 97(1) In an objective comprising two divergent meniscus doublets between two simple convergent components the radius of curvature of the cemented surface of the second component is greater than twelve times the focal length F of the objective, the radii of the cemented surface of the third component is between .55F and .75F. the refractive index of the divergent element of the third component is greater than that of the convergent element thereof which is greater than or equal to that of the fourth component which is greater than 1.70, the arithmetic mean of these three refractive indices being at least 1.72 of the thickness of the convergent element of the second component being at least .18F. Numerical data are given for one example of the objective shown.
GB5835/55A 1954-03-05 1955-02-28 Improvements in or relating to photographic objectives Expired GB765413A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH765413X 1954-03-05

Publications (1)

Publication Number Publication Date
GB765413A true GB765413A (en) 1957-01-09

Family

ID=4535001

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5835/55A Expired GB765413A (en) 1954-03-05 1955-02-28 Improvements in or relating to photographic objectives

Country Status (1)

Country Link
GB (1) GB765413A (en)

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