GB550519A - Improvements in or relating to a telephoto objective - Google Patents
Improvements in or relating to a telephoto objectiveInfo
- Publication number
- GB550519A GB550519A GB5788/42A GB578842A GB550519A GB 550519 A GB550519 A GB 550519A GB 5788/42 A GB5788/42 A GB 5788/42A GB 578842 A GB578842 A GB 578842A GB 550519 A GB550519 A GB 550519A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lie
- glass
- cemented
- component
- component iii
- 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)
- Surface Treatment Of Optical Elements (AREA)
Abstract
550,519. Telephoto objectives. KODAK, Ltd. April 29, 1942, No. 5788. Convention date, July 26, 1941. [Class 97 (i)] A front component consisting of a bi-convex element I cemented to the front of a negative element II is spaced from a rear negative meniscus component III a distance lying between 0.45 times the focal length F, and 0.9 F. The radius of the convex surface of the component III may lie between F/8 and F. The component III may be concave to the front or to the rear, its thickness may lie between 0.02 F and 0.20 F, and it may be simple or compound its concave surface bounding a glass having a refractive index less than 1.55; when it is compound, the radius of the cemented surface may lie between F/4 and F, and the glass behind the cemented surface may have a refractive index at least 0.07 greater than that of the glass in front of the surface, and a dispersive index not more than 15 less. The front surface of the front component may be strongly curved. Complete data for four examples are set out. Specification 536,556 is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US550519XA | 1941-07-26 | 1941-07-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB550519A true GB550519A (en) | 1943-01-12 |
Family
ID=21995254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5788/42A Expired GB550519A (en) | 1941-07-26 | 1942-04-29 | Improvements in or relating to a telephoto objective |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB550519A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2507164A (en) * | 1948-12-17 | 1950-05-09 | Eastman Kodak Co | Reverse telephoto lens for enlargers |
| EP4009091A3 (en) * | 2020-12-03 | 2022-07-20 | Samsung Electronics Co., Ltd. | Lens assembly and electronic device including the same |
-
1942
- 1942-04-29 GB GB5788/42A patent/GB550519A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2507164A (en) * | 1948-12-17 | 1950-05-09 | Eastman Kodak Co | Reverse telephoto lens for enlargers |
| EP4009091A3 (en) * | 2020-12-03 | 2022-07-20 | Samsung Electronics Co., Ltd. | Lens assembly and electronic device including the same |
| US11899169B2 (en) | 2020-12-03 | 2024-02-13 | Samsung Electronics Co., Ltd. | Lens assembly and electronic device including the same |
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