GB754620A - Improvements in or relating to photographic objectives of the petzval type - Google Patents

Improvements in or relating to photographic objectives of the petzval type

Info

Publication number
GB754620A
GB754620A GB25216/54A GB2521654A GB754620A GB 754620 A GB754620 A GB 754620A GB 25216/54 A GB25216/54 A GB 25216/54A GB 2521654 A GB2521654 A GB 2521654A GB 754620 A GB754620 A GB 754620A
Authority
GB
United Kingdom
Prior art keywords
objective
radius
relating
photographic objectives
focal length
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
GB25216/54A
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 GB754620A publication Critical patent/GB754620A/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)
  • Nitrogen Condensed Heterocyclic Rings (AREA)

Abstract

754,620. Photographic objectives. PAILLARD SOC. ANON. Aug. 31, 1954 [Nov. 4, 1953], No. 25216/54. Class 97 (1). An objective consists of two achromatic doublets each formed of two air-spaced elements and arranged so that the radius of the second surface of the first element in the front doublet and of the first surface of the second element thereof are each of absolute value at least 1-3 times that of the radius of the first surface of the said first element which is greater than 80 per cent of the focal length of the objective, and the radius of the second surface of the first element of the rear doublet is greater than that of the first surface thereof, the thickness of this element being between 10 and 25 per cent of the focal length of the objective. Numerical data are given for two examples of the objective shown.
GB25216/54A 1953-11-04 1954-08-31 Improvements in or relating to photographic objectives of the petzval type Expired GB754620A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH754620X 1953-11-04

Publications (1)

Publication Number Publication Date
GB754620A true GB754620A (en) 1956-08-08

Family

ID=4534159

Family Applications (1)

Application Number Title Priority Date Filing Date
GB25216/54A Expired GB754620A (en) 1953-11-04 1954-08-31 Improvements in or relating to photographic objectives of the petzval type

Country Status (1)

Country Link
GB (1) GB754620A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5392431A (en) * 1992-10-05 1995-02-21 Pfisterer; Richard N. TV projection lens including a graded index element

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5392431A (en) * 1992-10-05 1995-02-21 Pfisterer; Richard N. TV projection lens including a graded index element

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