GB818807A - A wide aperture tele-photo-lens - Google Patents
A wide aperture tele-photo-lensInfo
- Publication number
- GB818807A GB818807A GB19774/57A GB1977457A GB818807A GB 818807 A GB818807 A GB 818807A GB 19774/57 A GB19774/57 A GB 19774/57A GB 1977457 A GB1977457 A GB 1977457A GB 818807 A GB818807 A GB 818807A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lens
- doublet
- focal length
- tele
- photo
- 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)
- Lenses (AREA)
- Eyeglasses (AREA)
Abstract
818,807. Telephoto lenses. SCHNEIDER, M. C. June 24, 1957 [Aug. 7, 1956], No. 19774/57. Class 97(1) The positive part of the lens on the object side of the diaphragm comprises a front simple lens and a rear doublet, the negative part of the lens on the image side of the diaphragm comprises two simple lenses, the focal length f of the positive part is such that 0.85F<f<F (where F is the equivalent focal length) and the back focal length of the positive part is less than 0.65F. Preferably, the air gap between the front and rear parts of the lens lies between 0.4 times the total axial length of the lens and 0.4F. Also the ratio of the radii of the front and rear surfaces r 3 and r 5 of the doublet is preferably not greater than 1.3. and the refractive index difference in this doublet should not exceed 0.15. Optical data are given for two examples, one of which is shown.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE818807X | 1956-08-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB818807A true GB818807A (en) | 1959-08-26 |
Family
ID=6735540
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB19774/57A Expired GB818807A (en) | 1956-08-07 | 1957-06-24 | A wide aperture tele-photo-lens |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB818807A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110187478A (en) * | 2019-07-12 | 2019-08-30 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN110208927A (en) * | 2019-07-12 | 2019-09-06 | 浙江舜宇光学有限公司 | Optical imaging lens |
-
1957
- 1957-06-24 GB GB19774/57A patent/GB818807A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110187478A (en) * | 2019-07-12 | 2019-08-30 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN110208927A (en) * | 2019-07-12 | 2019-09-06 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN110208927B (en) * | 2019-07-12 | 2024-04-23 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN110187478B (en) * | 2019-07-12 | 2024-04-30 | 浙江舜宇光学有限公司 | Optical imaging lens |
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