GB472191A - Improvements in and relating to objectives suitable for photographic purposes - Google Patents
Improvements in and relating to objectives suitable for photographic purposesInfo
- Publication number
- GB472191A GB472191A GB1615036A GB1615036A GB472191A GB 472191 A GB472191 A GB 472191A GB 1615036 A GB1615036 A GB 1615036A GB 1615036 A GB1615036 A GB 1615036A GB 472191 A GB472191 A GB 472191A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lenses
- diaphragm
- positive
- lens
- objective
- 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
472,191. Lenses. HASSELKUS, J. W., and RICHMOND, G. A. June 9, 1936, No. 16150. [Class 97 (i)] A wide-angle photographic objective comprises a negative meniscus lens on each side of and adjacent to the diaphragm and three or more positive meniscus lenses disposed about the diaphragm, the concave surfaces of all the lenses being turned towards the diaphragm and the radii of curvature of all the lens surfaces being less than the focal length of the complete objective. The negative lenses have the same or substantially the same power and their refractive index differs from those of the positive lenses by at least 0À05. Data are given for the example shown having three positive menisci and giving a field of view of about 100‹ with an aperture of F/5À6. In this form the power of' the single positive lens in front of the diaphragm is greater than that of either of the two positive lenses behind the diaphragm. The objective may alternatively have four positive lenses, two on each side of the diaphragm, in which case the powers of at least two of the corresponding positive lenses are unequal. Specification 423,156 is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1615036A GB472191A (en) | 1936-06-09 | 1936-06-09 | Improvements in and relating to objectives suitable for photographic purposes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1615036A GB472191A (en) | 1936-06-09 | 1936-06-09 | Improvements in and relating to objectives suitable for photographic purposes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB472191A true GB472191A (en) | 1937-09-20 |
Family
ID=10072079
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1615036A Expired GB472191A (en) | 1936-06-09 | 1936-06-09 | Improvements in and relating to objectives suitable for photographic purposes |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB472191A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2559875A (en) * | 1949-12-21 | 1951-07-10 | Eastman Kodak Co | Wide angle corrected photographic objective comprising four meniscus components in axial alignment |
-
1936
- 1936-06-09 GB GB1615036A patent/GB472191A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2559875A (en) * | 1949-12-21 | 1951-07-10 | Eastman Kodak Co | Wide angle corrected photographic objective comprising four meniscus components in axial alignment |
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