GB408787A - Improved photographic objective - Google Patents
Improved photographic objectiveInfo
- Publication number
- GB408787A GB408787A GB631633A GB631633A GB408787A GB 408787 A GB408787 A GB 408787A GB 631633 A GB631633 A GB 631633A GB 631633 A GB631633 A GB 631633A GB 408787 A GB408787 A GB 408787A
- Authority
- GB
- United Kingdom
- Prior art keywords
- divergent
- collective
- convergent
- class
- refractive index
- 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
408,787. Lenses. WARMISHAM, A., 1625, Hinman Avenue, Evanston, Illinois, U.S.A., and KAPELLA, Ltd., 104, Stoughton Street, Leicester. March 2, 1933, Nos. 6316 and 20047. [Class 97 (i).] Relates to objectives of Petzval type com. prising a front convergent compound member and a rear member consisting of a divergent and a convergent component. To improve the flatness of the field and to reduce the over-correction of oblique spherical aberration, the convergent component of the rear member is compounded of three elements, the internal element being collective and of relatively high refractive index and the two outer elements being divergent menisci of lower refractive index, and the contact surface of the front compound member is made divergent and concave towards the longer conjugate. Axial zonal spherical aberration may be reduced by adding in front of the front compound member an air-spaced collective element, as shown, which may be planoconvex but is preferably of meniscus form, and still further improvement may be obtained by placing in front of this additional element a second air-spaced collective element, preferably plano-convex. Data are given for the example shown having an aperture of f /1.3 and corrected for a semi field of 14‹. Specification 258,092, [Class 97 (i)], is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB631633A GB408787A (en) | 1933-03-02 | 1933-03-02 | Improved photographic objective |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB631633A GB408787A (en) | 1933-03-02 | 1933-03-02 | Improved photographic objective |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB408787A true GB408787A (en) | 1934-04-19 |
Family
ID=9812277
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB631633A Expired GB408787A (en) | 1933-03-02 | 1933-03-02 | Improved photographic objective |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB408787A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2574995A (en) * | 1950-08-11 | 1951-11-13 | Eastman Kodak Co | Photographic objective consisting of three simple elements and a cemented triplet therebehind |
| DE1095540B (en) * | 1957-06-04 | 1960-12-22 | Farrand Optical Co Inc | lens |
| US3236151A (en) * | 1961-08-02 | 1966-02-22 | Josef Schneider & Co | Photographic or cinematographic high-speed teleobjective |
-
1933
- 1933-03-02 GB GB631633A patent/GB408787A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2574995A (en) * | 1950-08-11 | 1951-11-13 | Eastman Kodak Co | Photographic objective consisting of three simple elements and a cemented triplet therebehind |
| DE1095540B (en) * | 1957-06-04 | 1960-12-22 | Farrand Optical Co Inc | lens |
| US3236151A (en) * | 1961-08-02 | 1966-02-22 | Josef Schneider & Co | Photographic or cinematographic high-speed teleobjective |
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