GB548251A - Improvements in or relating to photographic objectives - Google Patents
Improvements in or relating to photographic objectivesInfo
- Publication number
- GB548251A GB548251A GB415341A GB415341A GB548251A GB 548251 A GB548251 A GB 548251A GB 415341 A GB415341 A GB 415341A GB 415341 A GB415341 A GB 415341A GB 548251 A GB548251 A GB 548251A
- Authority
- GB
- United Kingdom
- Prior art keywords
- refractive index
- radius
- cemented
- positive
- doublet
- 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
- G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
- G02B9/34—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having four components only
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
548,251. Lenses. KODAK, Ltd. (Eastman Kodak Co.). March 27, 1941, No. 4153. [Class 97 (i)] In a photographic objective having focal length F and consisting of two outer positive components and two inner meniscus components highly concave towards a diaphragm between them, the third component comprises a doublet consisting of a front negative element IV, having a refractive index greater than 1.6 cemented to a positive element V having a refractive index at least .04 greater than that of the positive element, the axial thickness of the doublet being less than .15 F, and the cemented surface having a radius R, between -0.5 F and -5 F. The refractive index of the element IV may be greater than 1.65 and the refractive index of the front component I may be between 1.55 and 1.59. The rear component, also, may consist of a doublet comprising a front negative element VI having a refractive index greater than 1.6 cemented to a positive element VII having a refractive index at least .04 greater than that of the element VI, the radius R 10 of the cemented surface being between .4 F and 4 F ; the refractive index of the element VI is preferably greater than 1.65. The radius R 9 of the front surface of the rear component may vary between infinity and + F, and the radius R 11 of the rear surface may vary between -0.5 F and infinity. Complete data for one example are set out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB415341A GB548251A (en) | 1941-03-27 | 1941-03-27 | Improvements in or relating to photographic objectives |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB415341A GB548251A (en) | 1941-03-27 | 1941-03-27 | Improvements in or relating to photographic objectives |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB548251A true GB548251A (en) | 1942-10-02 |
Family
ID=9771735
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB415341A Expired GB548251A (en) | 1941-03-27 | 1941-03-27 | Improvements in or relating to photographic objectives |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB548251A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2600207A (en) * | 1949-04-04 | 1952-06-10 | Taylor Taylor & Hobson Ltd | Four component optical objectives having four internal contact surfaces |
-
1941
- 1941-03-27 GB GB415341A patent/GB548251A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2600207A (en) * | 1949-04-04 | 1952-06-10 | Taylor Taylor & Hobson Ltd | Four component optical objectives having four internal contact surfaces |
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