GB816898A - Improvements relating to photographic objectives - Google Patents
Improvements relating to photographic objectivesInfo
- Publication number
- GB816898A GB816898A GB2920657A GB2920657A GB816898A GB 816898 A GB816898 A GB 816898A GB 2920657 A GB2920657 A GB 2920657A GB 2920657 A GB2920657 A GB 2920657A GB 816898 A GB816898 A GB 816898A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lens
- doublet
- air gap
- negative
- lies
- 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
- 230000003287 optical effect Effects 0.000 abstract 1
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)
- Lenses (AREA)
Abstract
816,898. Lens systems. ISCO OPTISCHE WERKE G.m.b.H. Sept. 17, 1957 [Nov. 10, 1956], No. 29206/57. Class 97(1) An asymmetrical wide-angle objective of back focal length greater than the equivalent focal length f comprises a rear system II of positive power separated by an air gap greater than f from a front system I consisting of two negative components of which the front one is a simple lens and the rear one a doublet made up of a front positive lens and a rear negative lens, the cemented surface of the doublet being concave to the front and the refractive index difference across this surface being more than 0.15. The air gap d between the components of system I lies between 0.6f and 0.75f and the air gap d, between the simple front lens and the following negative doublet of system II lies between 0.14f and 0.18f. The refractive index difference across the cemented surface r 9 of this doublet is preferably more than 0.25. The drawing shows one example for which optical data are given in the Specification.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEI12439A DE1063826B (en) | 1956-11-10 | 1956-11-10 | Asymmetrical photographic or cinematographic lens with a large field of view |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB816898A true GB816898A (en) | 1959-07-22 |
Family
ID=7185417
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2920657A Expired GB816898A (en) | 1956-11-10 | 1957-09-17 | Improvements relating to photographic objectives |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE1063826B (en) |
| FR (1) | FR1183899A (en) |
| GB (1) | GB816898A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1187393B (en) * | 1959-11-25 | 1965-02-18 | Zeiss Carl Fa | Photographic lens |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB741511A (en) * | 1953-08-04 | 1955-12-07 | Gordon Henry Cook | Improvements in or relating to optical objectives |
-
1956
- 1956-11-10 DE DEI12439A patent/DE1063826B/en active Pending
-
1957
- 1957-09-17 GB GB2920657A patent/GB816898A/en not_active Expired
- 1957-10-04 FR FR1183899D patent/FR1183899A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR1183899A (en) | 1959-07-15 |
| DE1063826B (en) | 1959-08-20 |
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