GB347996A - - Google Patents

Info

Publication number
GB347996A
GB347996A GB25935/30A GB2593530A GB347996A GB 347996 A GB347996 A GB 347996A GB 25935/30 A GB25935/30 A GB 25935/30A GB 2593530 A GB2593530 A GB 2593530A GB 347996 A GB347996 A GB 347996A
Authority
GB
United Kingdom
Prior art keywords
convergent
elements
lens
zeiss
combination
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
GB25935/30A
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.)
Carl Zeiss AG
Original Assignee
Carl Zeiss AG
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 Carl Zeiss AG filed Critical Carl Zeiss AG
Publication of GB347996A publication Critical patent/GB347996A/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

347,996. Lenses. ZEISS, C., Carl- Zeiss-Strasse, Jena, Germany. Aug. 30, 1930, No. 25935. Convention date, Sept. 10, 1929. [Class 97 (i).] A photographic lens of the Cooke type corrected for spherical and chromatic aberrations, coma, and astigmatism comprises a divergent element III placed between two convergent elements II, IV and a further convergent element I in front of the said three elements, the refractive index of each of the convergent elements being less than 1À52 and the vertex length of the combination being greater than one third of the focal length. The nu-value of each convergent lens is greater than 63 and that of the divergent lens is less than 37À5. Numerical data are given for the example shown, having a focal length of 200 cm. and an aperture of 40 cm., this combination being suitable for astronomical purposes.
GB25935/30A 1929-09-10 1930-08-30 Expired GB347996A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE347996T 1929-09-10

Publications (1)

Publication Number Publication Date
GB347996A true GB347996A (en) 1931-05-07

Family

ID=31895217

Family Applications (1)

Application Number Title Priority Date Filing Date
GB25935/30A Expired GB347996A (en) 1929-09-10 1930-08-30

Country Status (1)

Country Link
GB (1) GB347996A (en)

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