GB784039A - Photographic objective - Google Patents
Photographic objectiveInfo
- Publication number
- GB784039A GB784039A GB4384/56A GB438456A GB784039A GB 784039 A GB784039 A GB 784039A GB 4384/56 A GB4384/56 A GB 4384/56A GB 438456 A GB438456 A GB 438456A GB 784039 A GB784039 A GB 784039A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lenses
- objective
- diaphragm
- collective
- radii
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
784,039. Optical objectives. ZEISSSTIFTUNG, C., [trading as ZEISS, C. [Firm of]]. Feb. 13. 1956 [Feb. 15, 1955], No. 4384/56. Class 97(1) A photographic-objective consisting of six lenses of which the first and second are collective, the third and fourth are dispersive, the fifth and sixth are collective and in which the second and third lenses are cemented together and all surfaces having a radius numerically smaller than the focal length f are concave towards the diaphragm between the third and fourth lenses is characterized in that the following conditions are fulfilled simultaneously:- where #r s = arithmetic mean of the radii of the third and third last surfaces. Ds = the separation of the apices of these two surfaces. #r z = the arithmetic mean of the radii of the surfaces bounding the diaphragm space. D z = the length of the diaphragm space. L = overall length of the objective. d 7 = the airspace between the fourth and fifth lenses and d 3 , d 4 , ds, and ds are respectively the centre thicknesses of the second, third, fourth and fifth lenses. Numerical data are given for three examples of the objective shown.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE784039X | 1955-02-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB784039A true GB784039A (en) | 1957-10-02 |
Family
ID=6698450
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB4384/56A Expired GB784039A (en) | 1955-02-15 | 1956-02-13 | Photographic objective |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB784039A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2201257A (en) * | 1986-12-18 | 1988-08-24 | Asahi Optical Co Ltd | Reading lens system |
-
1956
- 1956-02-13 GB GB4384/56A patent/GB784039A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2201257A (en) * | 1986-12-18 | 1988-08-24 | Asahi Optical Co Ltd | Reading lens system |
GB2201257B (en) * | 1986-12-18 | 1990-09-05 | Asahi Optical Co Ltd | Reading lens system |
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