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GB312536A - Improvements in objectives - Google Patents

Improvements in objectives

Info

Publication number
GB312536A
GB312536A GB2049328A GB2049328A GB312536A GB 312536 A GB312536 A GB 312536A GB 2049328 A GB2049328 A GB 2049328A GB 2049328 A GB2049328 A GB 2049328A GB 312536 A GB312536 A GB 312536A
Authority
GB
United Kingdom
Prior art keywords
per cent
curvatures
radius
divergent
front component
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
GB2049328A
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 GB2049328A priority Critical patent/GB312536A/en
Publication of GB312536A publication Critical patent/GB312536A/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

312,536. Warmisham, A., and Kapella, Ltd. July 14, 1928. Lenses. - Objectives for photographic and like purposes of the kind comprising four separated simple components, the two inner ones being divergent and the two outer ones convergent have the front component of medium barium crown and the back component of heavy barium crown. The divergent components are of light flint with a refractive index 0.02 less than that of the front component, and the air spaces are between 1.4 per cent and 1.8 per cent of the equivalent focal length of the objective. The seventh radius is between 50 per cent and 70 per cent stronger than the second radius, the difference between the second and third curvatures being substantially equal to that between the sixth and seventh curvatures. Numerical data of one example are given in the Specification and Specification 113,590 is referred to.
GB2049328A 1928-07-14 1928-07-14 Improvements in objectives Expired GB312536A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2049328A GB312536A (en) 1928-07-14 1928-07-14 Improvements in objectives

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2049328A GB312536A (en) 1928-07-14 1928-07-14 Improvements in objectives

Publications (1)

Publication Number Publication Date
GB312536A true GB312536A (en) 1929-05-30

Family

ID=10146787

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2049328A Expired GB312536A (en) 1928-07-14 1928-07-14 Improvements in objectives

Country Status (1)

Country Link
GB (1) GB312536A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58220116A (en) * 1982-06-17 1983-12-21 Asahi Optical Co Ltd Lens system for copying

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58220116A (en) * 1982-06-17 1983-12-21 Asahi Optical Co Ltd Lens system for copying
JPS6151290B2 (en) * 1982-06-17 1986-11-08 Asahi Optical Co Ltd

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