GB234091A - Improvements in or relating to lenses - Google Patents

Improvements in or relating to lenses

Info

Publication number
GB234091A
GB234091A GB12129/25A GB1212925A GB234091A GB 234091 A GB234091 A GB 234091A GB 12129/25 A GB12129/25 A GB 12129/25A GB 1212925 A GB1212925 A GB 1212925A GB 234091 A GB234091 A GB 234091A
Authority
GB
United Kingdom
Prior art keywords
dispersive
curvature
radius
lenses
cemented
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
GB12129/25A
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.)
Optische Anstalt CP Goerz AG
Original Assignee
Optische Anstalt CP Goerz 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 Optische Anstalt CP Goerz AG filed Critical Optische Anstalt CP Goerz AG
Publication of GB234091A publication Critical patent/GB234091A/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
    • G02B13/02—Telephoto objectives, i.e. systems of the type + - in which the distance from the front vertex to the image plane is less than the equivalent focal length

Landscapes

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

Abstract

234,091. Optische Anstalt C. P. Goerz Akt.-Ges. May 14, 1924, [Convention date]. Lenses.-Telephoto objectives comprising two cemented doublets, one collective and the other dispersive, the latter being at a fixed distance from the former and of meniscus form, have the cemented surface of the dispersive member dispersive and curved in the same direction as the outer surfaces. The radius of curvature of the cemented surface of the dispersive member is not larger than five times the radius of curvature of the concave face and is greater than the radius of curvature of the convex face. Constructional data are given in the Specification.
GB12129/25A 1924-05-14 1925-05-09 Improvements in or relating to lenses Expired GB234091A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE234091X 1924-05-14

Publications (1)

Publication Number Publication Date
GB234091A true GB234091A (en) 1925-08-16

Family

ID=5889612

Family Applications (1)

Application Number Title Priority Date Filing Date
GB12129/25A Expired GB234091A (en) 1924-05-14 1925-05-09 Improvements in or relating to lenses

Country Status (1)

Country Link
GB (1) GB234091A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5764425A (en) * 1995-08-17 1998-06-09 Nikon Corporation Telephoto lens

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5764425A (en) * 1995-08-17 1998-06-09 Nikon Corporation Telephoto lens

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