GB297823A - Improvements in objectives corrected spherically, chromatically, astigmatically and for coma - Google Patents
Improvements in objectives corrected spherically, chromatically, astigmatically and for comaInfo
- Publication number
- GB297823A GB297823A GB25209/28A GB2520928A GB297823A GB 297823 A GB297823 A GB 297823A GB 25209/28 A GB25209/28 A GB 25209/28A GB 2520928 A GB2520928 A GB 2520928A GB 297823 A GB297823 A GB 297823A
- Authority
- GB
- United Kingdom
- Prior art keywords
- collective
- lens
- lenses
- coma
- radii
- 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
297,823. Zeiss, C. [Firm of]. Sept. 29, 1927, [Convention date]. Lenses. - Photographic objectives corrected for spherical aberration, chromatism astigmatism and coma consisting of four lenses, separated by air, of which the two outer ones are collective and the two inner ones dispersive and distinctly meniscus in form, have the collective lenses facing the image distinctly biconvex and the other collective lenses constructed with radii of curvature, the ratio of which is algebraically larger than that of the corresponding ratio of the radii of the collective lenses facing the image. The front collective lens is a meniscus lens. The radius of curvature of one of the boundary surfaces of the intermediate air lens is at least 10 per cent larger than that of the other boundary surface. The double convex collective lens is of glass of refractive index not less than 1.61 or when consisting of a cemented doublet the average of the refractive indices of the elements is at least 1.61. Numerical data are given in the Specification for a lens having an aperture of 1 : 1.4.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE297823X | 1927-09-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB297823A true GB297823A (en) | 1929-06-27 |
Family
ID=6090787
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB25209/28A Expired GB297823A (en) | 1927-09-29 | 1928-09-03 | Improvements in objectives corrected spherically, chromatically, astigmatically and for coma |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB297823A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2771817A (en) * | 1955-03-31 | 1956-11-27 | Eastman Kodak Co | Seven-element gauss type objective comprising two negative meniscus components enclosed by two positive components |
| DE1102434B (en) * | 1955-01-03 | 1961-03-16 | Canon Camera Company Inc | Photographic lens Gaussian design |
-
1928
- 1928-09-03 GB GB25209/28A patent/GB297823A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1102434B (en) * | 1955-01-03 | 1961-03-16 | Canon Camera Company Inc | Photographic lens Gaussian design |
| US2771817A (en) * | 1955-03-31 | 1956-11-27 | Eastman Kodak Co | Seven-element gauss type objective comprising two negative meniscus components enclosed by two positive components |
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