GB191104714A - Improvements in Photographic Lenses. - Google Patents

Improvements in Photographic Lenses.

Info

Publication number
GB191104714A
GB191104714A GB191104714DA GB191104714A GB 191104714 A GB191104714 A GB 191104714A GB 191104714D A GB191104714D A GB 191104714DA GB 191104714 A GB191104714 A GB 191104714A
Authority
GB
United Kingdom
Prior art keywords
lenses
lens
beck
dispersion
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
Inventor
Conrad Beck
Horace Courthope Beck
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of GB191104714A publication Critical patent/GB191104714A/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

4714. Beck, C., and Beck, H. C. Feb. 24. Lenses.-A three-lens photographic objective, of the Taylor type, working at a large aperture and having a field of more than fifty degrees, is composed of t w o positive lenses L', L<3> approximately plano-convex made from glass having low or moderate refraction and dispersion, and placed on either side of a doubleconcave lens L<2> of higher refraction and dispersion. The focal length of the lens L<2> is at least three-tenths that of the whole combination and the axial separation of the outside lenses is not more than about one-quarter of such total focal length. Optical data are given in the Specification.
GB191104714D 1911-02-24 1911-02-24 Improvements in Photographic Lenses. Expired GB191104714A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB191104714T 1911-02-24

Publications (1)

Publication Number Publication Date
GB191104714A true GB191104714A (en) 1911-10-12

Family

ID=32496985

Family Applications (1)

Application Number Title Priority Date Filing Date
GB191104714D Expired GB191104714A (en) 1911-02-24 1911-02-24 Improvements in Photographic Lenses.

Country Status (1)

Country Link
GB (1) GB191104714A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2453260A (en) * 1947-03-27 1948-11-09 Bausch & Lomb Three element objective lens
US5596455A (en) * 1995-06-29 1997-01-21 Minnesota Mining And Manufacturing Company Fixed-focus triplet projection lens for overhead projectors

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2453260A (en) * 1947-03-27 1948-11-09 Bausch & Lomb Three element objective lens
US5596455A (en) * 1995-06-29 1997-01-21 Minnesota Mining And Manufacturing Company Fixed-focus triplet projection lens for overhead projectors

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