GB766975A - Improvements in photographic objectives - Google Patents
Improvements in photographic objectivesInfo
- Publication number
- GB766975A GB766975A GB766855A GB766855A GB766975A GB 766975 A GB766975 A GB 766975A GB 766855 A GB766855 A GB 766855A GB 766855 A GB766855 A GB 766855A GB 766975 A GB766975 A GB 766975A
- Authority
- GB
- United Kingdom
- Prior art keywords
- component
- less
- meniscus
- collective
- dispersive
- 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
- G02B13/04—Reversed telephoto objectives
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Glass Compositions (AREA)
- Lenses (AREA)
Abstract
766,975. Photographic objectives. VEB C. ZEISS JENA. March 16, 1955, No. 7668/55. Class 97(1) In an objective of the kind consisting of a front dispersive meniscus component situated at a considerable distance from a collective member consisting of two dispersive meniscus components concave to a diaphragm therebetween and enclosed by a front simple collective component and a rear collective meniscus component, the front dispersive meniscus component is simple and has an Abbe number greater than 55 and less than 65, the front component of the collective member is of flint glass of Abbe number greater than 40 and less than 50, the dispersive meniscus in front of the diaphragm consists of two lenses cemented together and having a difference of refractive index greater than 0 and less than 0.2, the dispersive meniscus following the diaphragm is simple and has a refractive, index greater than 1.7 and the refractive index of each lens of the rearmost component is greater than 1.6 and less than 1.7 Numerical data are given for one example of the objective shown and for one in which the rear most compartmen is a cemented doublet.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB766855A GB766975A (en) | 1955-03-16 | 1955-03-16 | Improvements in photographic objectives |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB766855A GB766975A (en) | 1955-03-16 | 1955-03-16 | Improvements in photographic objectives |
Publications (1)
Publication Number | Publication Date |
---|---|
GB766975A true GB766975A (en) | 1957-01-30 |
Family
ID=9837523
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB766855A Expired GB766975A (en) | 1955-03-16 | 1955-03-16 | Improvements in photographic objectives |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB766975A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2962931A (en) * | 1958-12-12 | 1960-12-06 | Bell & Howell Co | Optical objective |
-
1955
- 1955-03-16 GB GB766855A patent/GB766975A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2962931A (en) * | 1958-12-12 | 1960-12-06 | Bell & Howell Co | Optical objective |
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