GB612474A - Improvements in and relating to wide aperture objectives - Google Patents

Improvements in and relating to wide aperture objectives

Info

Publication number
GB612474A
GB612474A GB1583646A GB1583646A GB612474A GB 612474 A GB612474 A GB 612474A GB 1583646 A GB1583646 A GB 1583646A GB 1583646 A GB1583646 A GB 1583646A GB 612474 A GB612474 A GB 612474A
Authority
GB
United Kingdom
Prior art keywords
lenses
positive
doublets
focal length
negative
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
GB1583646A
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.)
ROSS Ltd
Original Assignee
ROSS 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 ROSS Ltd filed Critical ROSS Ltd
Priority to GB1583646A priority Critical patent/GB612474A/en
Publication of GB612474A publication Critical patent/GB612474A/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

612,474. Optical objectives. ROSS, Ltd., and COOK, G. H. May 24, 1946, No. 15836. [Class 97 (i)] In an objective of the type shown comprising two simple positive components enclosing two meniscus doublets concave to a central diaphragm the doublets comprise negative and positive meniscus lenses cemented together and (a) all six lenses have refractive indices greater than 1.65 ; (b) the refractive index difference at cemented surfaces in not greater than 0.04 ; (c) the AbbÚ-V values for the outer positive components are greater than 53 and in the doublets the positive lenses have a greater V value than the corresponding negative lenses; (d) the focal length of one of the positive components is between F and 2F and that of the other between .5F and 1.5F where F is the focal length of the whole system; (e) the focal length of one negative component is between 1.5F and 2.5F, while that of the other is greater than 2F. Numerical data for one example are given. Specification 507,590 is referred to.
GB1583646A 1946-05-24 1946-05-24 Improvements in and relating to wide aperture objectives Expired GB612474A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1583646A GB612474A (en) 1946-05-24 1946-05-24 Improvements in and relating to wide aperture objectives

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1583646A GB612474A (en) 1946-05-24 1946-05-24 Improvements in and relating to wide aperture objectives

Publications (1)

Publication Number Publication Date
GB612474A true GB612474A (en) 1948-11-12

Family

ID=10066401

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1583646A Expired GB612474A (en) 1946-05-24 1946-05-24 Improvements in and relating to wide aperture objectives

Country Status (1)

Country Link
GB (1) GB612474A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2892381A (en) * 1953-02-09 1959-06-30 James G Baker Corrected photographic objective for night photography
US3029698A (en) * 1957-10-26 1962-04-17 Agfa Ag Fa High-power photographic objective
JPS5695206A (en) * 1979-12-05 1981-08-01 Ricoh Co Ltd Gauss type lens

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2892381A (en) * 1953-02-09 1959-06-30 James G Baker Corrected photographic objective for night photography
US3029698A (en) * 1957-10-26 1962-04-17 Agfa Ag Fa High-power photographic objective
JPS5695206A (en) * 1979-12-05 1981-08-01 Ricoh Co Ltd Gauss type lens

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