GB397261A - Zonal spherical aberration correction of photographic lenses - Google Patents
Zonal spherical aberration correction of photographic lensesInfo
- Publication number
- GB397261A GB397261A GB1394132A GB1394132A GB397261A GB 397261 A GB397261 A GB 397261A GB 1394132 A GB1394132 A GB 1394132A GB 1394132 A GB1394132 A GB 1394132A GB 397261 A GB397261 A GB 397261A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lens
- zones
- corrected
- spherical aberration
- aberration correction
- 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
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Eyeglasses (AREA)
Abstract
397,261. Lenses. KAPELLA, Ltd., 104, Stoughton Street, Leicester.-- Warmisham, A. ; 1625, Hinman Avenue, Evanston, Illinois, U.S.A.) May 14, 1932, No. 13941. [Class 97 (i).] In order to provide a photographic lens having greater depth of focus behind the plane of the principal object focused than in front of this plane, the lens is spherically over-corrected in its central zones and is under-corrected in its marginal zones by making one or more of its surfaces aspherical. Preferably the lens is first made with spherical surfaces so as to be spherically over-corrected in all zones, and then the correction in the marginal zones is inverted by removing from the marginal zones of one or more surfaces material increasing in amount regularly from zero towards the edge of the lens. In the lens shown, for which constructional data are given, the surfaces R5, R6 are deformed as above described, commencing at a zone corresponding to an aperture of about F/3-5, the amount of material removed from the edges being about 400 wave-lengths of sodium light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1394132A GB397261A (en) | 1931-05-14 | 1931-05-14 | Zonal spherical aberration correction of photographic lenses |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1394132A GB397261A (en) | 1931-05-14 | 1931-05-14 | Zonal spherical aberration correction of photographic lenses |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB397261A true GB397261A (en) | 1933-08-24 |
Family
ID=10032145
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1394132A Expired GB397261A (en) | 1931-05-14 | 1931-05-14 | Zonal spherical aberration correction of photographic lenses |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB397261A (en) |
-
1931
- 1931-05-14 GB GB1394132A patent/GB397261A/en not_active Expired
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