GB194608A - Improvements in photographic objectives - Google Patents
Improvements in photographic objectivesInfo
- Publication number
- GB194608A GB194608A GB1690322A GB1690322A GB194608A GB 194608 A GB194608 A GB 194608A GB 1690322 A GB1690322 A GB 1690322A GB 1690322 A GB1690322 A GB 1690322A GB 194608 A GB194608 A GB 194608A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lenses
- refractive index
- negative
- positive
- photographic objectives
- 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
194,608. Graf, C. June 19, 1922. Lenses.-A soft focus photographic objective is similar in form to the lens described in Specification 22400/10, but differs from it in the thickness of the lenses, the radii of curvature and the separations of the lenses, so that a certain amount of spherical aberration remains uncorrected. The negative lenses arranged between the positive lenses are symmetrical with regard to curvatures and refractive index, and the positive lenses are unsymmetrical, and have a refractive index greater than that of the negative lenses. In the example given by numerical data, the index of refraction for the G-line of all the lenses is the same.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1690322A GB194608A (en) | 1922-06-19 | 1922-06-19 | Improvements in photographic objectives |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1690322A GB194608A (en) | 1922-06-19 | 1922-06-19 | Improvements in photographic objectives |
Publications (1)
Publication Number | Publication Date |
---|---|
GB194608A true GB194608A (en) | 1923-03-15 |
Family
ID=10085747
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1690322A Expired GB194608A (en) | 1922-06-19 | 1922-06-19 | Improvements in photographic objectives |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB194608A (en) |
-
1922
- 1922-06-19 GB GB1690322A patent/GB194608A/en not_active Expired
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