GB472191A - 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
GB472191A
GB472191A GB1615036A GB1615036A GB472191A GB 472191 A GB472191 A GB 472191A GB 1615036 A GB1615036 A GB 1615036A GB 1615036 A GB1615036 A GB 1615036A GB 472191 A GB472191 A GB 472191A
Authority
GB
United Kingdom
Prior art keywords
lenses
diaphragm
positive
lens
objective
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
GB1615036A
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 GB1615036A priority Critical patent/GB472191A/en
Publication of GB472191A publication Critical patent/GB472191A/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

472,191. Lenses. HASSELKUS, J. W., and RICHMOND, G. A. June 9, 1936, No. 16150. [Class 97 (i)] A wide-angle photographic objective comprises a negative meniscus lens on each side of and adjacent to the diaphragm and three or more positive meniscus lenses disposed about the diaphragm, the concave surfaces of all the lenses being turned towards the diaphragm and the radii of curvature of all the lens surfaces being less than the focal length of the complete objective. The negative lenses have the same or substantially the same power and their refractive index differs from those of the positive lenses by at least 0À05. Data are given for the example shown having three positive menisci and giving a field of view of about 100‹ with an aperture of F/5À6. In this form the power of' the single positive lens in front of the diaphragm is greater than that of either of the two positive lenses behind the diaphragm. The objective may alternatively have four positive lenses, two on each side of the diaphragm, in which case the powers of at least two of the corresponding positive lenses are unequal. Specification 423,156 is referred to.
GB1615036A 1936-06-09 1936-06-09 Improvements in and relating to objectives suitable for photographic purposes Expired GB472191A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1615036A GB472191A (en) 1936-06-09 1936-06-09 Improvements in and relating to objectives suitable for photographic purposes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1615036A GB472191A (en) 1936-06-09 1936-06-09 Improvements in and relating to objectives suitable for photographic purposes

Publications (1)

Publication Number Publication Date
GB472191A true GB472191A (en) 1937-09-20

Family

ID=10072079

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1615036A Expired GB472191A (en) 1936-06-09 1936-06-09 Improvements in and relating to objectives suitable for photographic purposes

Country Status (1)

Country Link
GB (1) GB472191A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2559875A (en) * 1949-12-21 1951-07-10 Eastman Kodak Co Wide angle corrected photographic objective comprising four meniscus components in axial alignment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2559875A (en) * 1949-12-21 1951-07-10 Eastman Kodak Co Wide angle corrected photographic objective comprising four meniscus components in axial alignment

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