GB713868A - Photographic objective - Google Patents

Photographic objective

Info

Publication number
GB713868A
GB713868A GB29674/51A GB2967451A GB713868A GB 713868 A GB713868 A GB 713868A GB 29674/51 A GB29674/51 A GB 29674/51A GB 2967451 A GB2967451 A GB 2967451A GB 713868 A GB713868 A GB 713868A
Authority
GB
United Kingdom
Prior art keywords
doublets
objective
elements
negative
positive
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
GB29674/51A
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.)
Agfa Gevaert NV
Original Assignee
Agfa Camera Werk 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 Agfa Camera Werk AG filed Critical Agfa Camera Werk AG
Publication of GB713868A publication Critical patent/GB713868A/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

Abstract

713,868. Photographic objectives. AGFA CAMERA-WERK AKT.-GES. Dec. 18, 1951 [March 15, 1951], No. 29674/51. Class 97(1) In a corrected objective of the type consisting of two outer single convergent elements air-spaced from and enclosing two negative meniscus doublets concave to a stop between them and each consisting of a positive element cemented to a negative element, each of the positive elements in the doublets is of a glass having a mean refractive index of at least 1.65 and the sum of the absolute values of the focal lengths of the negative elements of the doublets is greater than 90 per cent of the focal length of the objective. Numerical data are given for three examples of the objective shown.
GB29674/51A 1951-03-15 1951-12-18 Photographic objective Expired GB713868A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE713868X 1951-03-15

Publications (1)

Publication Number Publication Date
GB713868A true GB713868A (en) 1954-08-18

Family

ID=6624448

Family Applications (1)

Application Number Title Priority Date Filing Date
GB29674/51A Expired GB713868A (en) 1951-03-15 1951-12-18 Photographic objective

Country Status (1)

Country Link
GB (1) GB713868A (en)

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