GB329144A - Improvements in photographic objectives - Google Patents

Improvements in photographic objectives

Info

Publication number
GB329144A
GB329144A GB1377729A GB1377729A GB329144A GB 329144 A GB329144 A GB 329144A GB 1377729 A GB1377729 A GB 1377729A GB 1377729 A GB1377729 A GB 1377729A GB 329144 A GB329144 A GB 329144A
Authority
GB
United Kingdom
Prior art keywords
glass
objective
type
dense
double
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
GB1377729A
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 GB1377729A priority Critical patent/GB329144A/en
Publication of GB329144A publication Critical patent/GB329144A/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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/34—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having four components only

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

329,144. Warmisham, A., and Kapellla, Ltd. May 3, 1929. Lenses. - Photographic objectives of large aperture having a flat field and good central definition are based on the Petzval type of objective. The usual cemented doublet front glass of this type of objective is replaced by a separated doublet in which the convergent member is double convex and of Dense Barium Crown glass and the divergent member is double concave and made of a Dense Flint glass. The single dispersive member of the type is replaced by a, cemented doublet dispersive member comprising a double convex component made of Dense Barium Crown glass having a refractive index greater than 1.60, and a double concave dispersive member of light Flint glass having a refractive index not exceeding 1.575. Numerical data for such an objective having an aperture F/1.8 are given in the Specification.
GB1377729A 1929-05-03 1929-05-03 Improvements in photographic objectives Expired GB329144A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1377729A GB329144A (en) 1929-05-03 1929-05-03 Improvements in photographic objectives

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1377729A GB329144A (en) 1929-05-03 1929-05-03 Improvements in photographic objectives

Publications (1)

Publication Number Publication Date
GB329144A true GB329144A (en) 1930-05-15

Family

ID=10029168

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1377729A Expired GB329144A (en) 1929-05-03 1929-05-03 Improvements in photographic objectives

Country Status (1)

Country Link
GB (1) GB329144A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3185033A (en) * 1962-09-27 1965-05-25 Bausch & Lomb Modified petzval type photographic objective

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3185033A (en) * 1962-09-27 1965-05-25 Bausch & Lomb Modified petzval type photographic objective

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