GB346171A - Improvements in objectives - Google Patents

Improvements in objectives

Info

Publication number
GB346171A
GB346171A GB1149930A GB1149930A GB346171A GB 346171 A GB346171 A GB 346171A GB 1149930 A GB1149930 A GB 1149930A GB 1149930 A GB1149930 A GB 1149930A GB 346171 A GB346171 A GB 346171A
Authority
GB
United Kingdom
Prior art keywords
convergent
members
doublets
aperture
class
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
GB1149930A
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.)
Kapella Ltd
Original Assignee
Kapella 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 Kapella Ltd filed Critical Kapella Ltd
Priority to GB1149930A priority Critical patent/GB346171A/en
Publication of GB346171A publication Critical patent/GB346171A/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

346,171. Lenses. WARMISHAM, A. and KAPELLA, Ltd., 104, Stoughton Street, Leicester. April 11, 1930, No. 11499. [Class 97 (i).] In a photographic or projection objective of the kind shown in Fig. 10 of Specification 168,923, [Class 97 (i), Optical systems &c.], comprising five members of which the first is convergent, the second and third are divergent and bi-concave, and the fourth and fifth are convergent, the first member and either or both of the fourth and fifth are made as convergent doublets, each of the cemented surfaces being convergent and concave towards the longer conjugate. The second and third members are unsymmetrical and present their faces of weaker curvature towards each other. The object of the invention is to increase the aperture and to provide improved correction of zonal spherical aberration simultaneously with improved approximation to flatness of field. Numerical data are given for two examples having an aperture of f/1, one being that shown and the other a combination in which the first and fourth members are doublets.
GB1149930A 1930-04-11 1930-04-11 Improvements in objectives Expired GB346171A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1149930A GB346171A (en) 1930-04-11 1930-04-11 Improvements in objectives

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1149930A GB346171A (en) 1930-04-11 1930-04-11 Improvements in objectives

Publications (1)

Publication Number Publication Date
GB346171A true GB346171A (en) 1931-04-09

Family

ID=9987368

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1149930A Expired GB346171A (en) 1930-04-11 1930-04-11 Improvements in objectives

Country Status (1)

Country Link
GB (1) GB346171A (en)

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