GB967924A - Photographic objective of variable focal length - Google Patents
Photographic objective of variable focal lengthInfo
- Publication number
- GB967924A GB967924A GB17145/63A GB1714563A GB967924A GB 967924 A GB967924 A GB 967924A GB 17145/63 A GB17145/63 A GB 17145/63A GB 1714563 A GB1714563 A GB 1714563A GB 967924 A GB967924 A GB 967924A
- Authority
- GB
- United Kingdom
- Prior art keywords
- focal length
- lens group
- dispersive lens
- variable focal
- air space
- 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
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/144—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only
- G02B15/1441—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive
- G02B15/144109—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive arranged +--+
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
967,924. Variable focal length objectives. CARL ZEISS-STIFTUNG, [trading as C. ZEISS [firm of]]. May 1, 1963 [May 10, 1962], No.17145/63. Heading G2J. In a variable focal length objective having two outer convergent lens groups A, D, and two inner dispersive lens groups B, C, which are relatively displaceable, the front dispersive lens group B has at least three elements of which the rear one is a convergent meniscus concave towards the rear. Preferably the air space immediately in front of this menisus element is between -0.05 times and -0. 30 times the focal length of the dispersive lens group B and has the shape of a meniscus concave towards the rear. Moreover the radii of the surfaces bordering this air space are each between the -0. 50 times and -2. 00 times the focal length of the dispersive lens group B. In addition the difference between these radii is numerically less than the thickness of the air space. Preferably also in this dispersive lens group each element is bent in such a way that the refractive power of the front surface is greater than the refractive power of the rear surface. The other dispersive lens Group C may consist of a meniscus element convex towards the rear. Optical data are given for one example of the objective shown.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB6770/68A GB1164985A (en) | 1963-05-01 | 1968-02-12 | Variable-Focal-Length Lens. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEZ9406A DE1180964B (en) | 1962-05-10 | 1962-05-10 | Photographic lens with adjustable focal length |
Publications (1)
Publication Number | Publication Date |
---|---|
GB967924A true GB967924A (en) | 1964-08-26 |
Family
ID=7620898
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB17145/63A Expired GB967924A (en) | 1962-05-10 | 1963-05-01 | Photographic objective of variable focal length |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE1180964B (en) |
GB (1) | GB967924A (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1286308B (en) * | 1966-09-14 | 1969-01-02 | Asahi Optical Co Ltd | Lens changeable focal length |
FR1537687A (en) * | 1967-01-30 | 1968-09-07 | Commissariat Energie Atomique | Improvements to reproductive goals |
-
1962
- 1962-05-10 DE DEZ9406A patent/DE1180964B/en active Pending
-
1963
- 1963-05-01 GB GB17145/63A patent/GB967924A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE1180964B (en) | 1964-11-05 |
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