GB323138A - Improvements in and relating to objectives suitable for photographic purposes - Google Patents

Improvements in and relating to objectives suitable for photographic purposes

Info

Publication number
GB323138A
GB323138A GB288529A GB288529A GB323138A GB 323138 A GB323138 A GB 323138A GB 288529 A GB288529 A GB 288529A GB 288529 A GB288529 A GB 288529A GB 323138 A GB323138 A GB 323138A
Authority
GB
United Kingdom
Prior art keywords
doublet
negative
meniscus
lens
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
GB288529A
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.)
GEORGE ARTHUR RICHMOND
Original Assignee
GEORGE ARTHUR RICHMOND
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 GEORGE ARTHUR RICHMOND filed Critical GEORGE ARTHUR RICHMOND
Priority to GB288529A priority Critical patent/GB323138A/en
Publication of GB323138A publication Critical patent/GB323138A/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

323,138. Hasselkus, J. W., and Richmond, G. A. Jan. 28, 1929. Lenses. - Photographic objectives of the kind having front and back combinations of lenses each consisting of a negative doublet and a single lens, have the negative doublet composed of a negative, meniscus lens and a positive meniscus lens, the negative meniscus being of a higher refracture index than the collective meniscus and disposed nearer to the diaphragm. The single positive lens is arranged with an intervening air space on the side of the doublet remote from the diaphragm with the surface of greater radius towards the doublet. The focal length of the front combination is approximately double that of the back combination, and the focal length of the front negative doublet is approximately half that of the back negative doublet. The objectives have a large aperture and angle of view and a high degree of correction. Numerical data are given in the Specification for an objective with an aperture of F/1.9 and a field of 50‹, corrected for spherical, zonal, chromatic, and comatic aberrations.
GB288529A 1929-01-28 1929-01-28 Improvements in and relating to objectives suitable for photographic purposes Expired GB323138A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB288529A GB323138A (en) 1929-01-28 1929-01-28 Improvements in and relating to objectives suitable for photographic purposes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB288529A GB323138A (en) 1929-01-28 1929-01-28 Improvements in and relating to objectives suitable for photographic purposes

Publications (1)

Publication Number Publication Date
GB323138A true GB323138A (en) 1929-12-24

Family

ID=9747834

Family Applications (1)

Application Number Title Priority Date Filing Date
GB288529A Expired GB323138A (en) 1929-01-28 1929-01-28 Improvements in and relating to objectives suitable for photographic purposes

Country Status (1)

Country Link
GB (1) GB323138A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2416032A (en) * 1942-10-06 1947-02-18 Warmisham Arthur Optical objective
US2475938A (en) * 1943-11-20 1949-07-12 Eastman Kodak Co Four-component objective for microcopying cameras
US2854890A (en) * 1955-01-14 1958-10-07 Canon Camera Co High aperture wide angle lens
US3029698A (en) * 1957-10-26 1962-04-17 Agfa Ag Fa High-power photographic objective

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2416032A (en) * 1942-10-06 1947-02-18 Warmisham Arthur Optical objective
US2475938A (en) * 1943-11-20 1949-07-12 Eastman Kodak Co Four-component objective for microcopying cameras
US2854890A (en) * 1955-01-14 1958-10-07 Canon Camera Co High aperture wide angle lens
US3029698A (en) * 1957-10-26 1962-04-17 Agfa Ag Fa High-power photographic objective

Similar Documents

Publication Publication Date Title
US2440088A (en) Optical lens system
US2019985A (en) Lens
US1540752A (en) Objective lens system
US1777262A (en) Objective suitable for photographic purposes
GB222709A (en) Improvements in telephoto objectives
GB323138A (en) Improvements in and relating to objectives suitable for photographic purposes
US1421156A (en) Objective for photographic and like purposes
US2124356A (en) Photographic objective
US1779257A (en) Lens
US1849681A (en) Photographic three-lens objective
US1880394A (en) Photographic objective
GB299983A (en) Improvements in lenses
US1839011A (en) Lens combination
US1975678A (en) Objective
GB295519A (en) Improvements in and relating to objectives suitable for photographic purposes
GB487453A (en) Improved lens system
US1897896A (en) Objective
US2424827A (en) Extreme aperture objective
GB592144A (en) Improvements in and relating to objectives suitable for photographic purposes
GB472191A (en) Improvements in and relating to objectives suitable for photographic purposes
GB278338A (en) Improvements in photographic objectives
GB317697A (en) Photographic and process lenses
GB507590A (en) Improvements in or relating to objectives suitable for photographic purposes
GB309749A (en) Improvements in and relating to telescopes, sighting devices and so forth
GB477448A (en) Improvements in and relating to objectives