GB234091A - Improvements in or relating to lenses - Google Patents
Improvements in or relating to lensesInfo
- 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
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.
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5764425A (en) * | 1995-08-17 | 1998-06-09 | Nikon Corporation | Telephoto lens |
-
1925
- 1925-05-09 GB GB12129/25A patent/GB234091A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5764425A (en) * | 1995-08-17 | 1998-06-09 | Nikon Corporation | Telephoto lens |
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