GB551391A - Improvements in or relating to variable power telescopes - Google Patents
Improvements in or relating to variable power telescopesInfo
- Publication number
- GB551391A GB551391A GB308942A GB308942A GB551391A GB 551391 A GB551391 A GB 551391A GB 308942 A GB308942 A GB 308942A GB 308942 A GB308942 A GB 308942A GB 551391 A GB551391 A GB 551391A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lens
- telescope
- objective
- reflector
- operative position
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
551,391. Telescopes; optical systems. PHILIPS LAMPS, Ltd. (Naamlooze Vennootschap Philips' Gloeilampenfabrieken). March 9, 1942, No. 3089. [Class 97 (i)] A high-magnification reflecting telescope and a low-magnification finder telescope have a common eyepiece, the image produced by the reflecting objective being presented to the eyepiece by means of a plurality of reflectors of which at least one is movable from its operative position. As shown, a spherical reflector 10, having a lens 11 to eliminate spherical aberration, forms the objective of the telescope, and, by means of mirrors 17, 18, 19, its image is formed at F<SP>13</SP> within the finder telescope. The finder has a lenticular objective 13, a magnifying erecting lens 14, and a focusable evepiece 24. The mirror 19 may be small and light, and be movable to the operative position, against the action of a spring, by means of a Bowden cable. The whole instrument is adjusted so that a graticule 23 limits the part of the image produced by the lens 13 which is to be examined with high magnification, and the mirror 19 is then moved into operative position for the purpose. The reflector 10 may be the metallized concave surface of. a spectacle lens having a focal length of 50 cms., and the lens 11 may be spherical and meniscus, e.g. a spectacle lens may be placed at the focus of the reflector 10, and may have a power of -0.25 dioptres. The lens 11 may be omitted, may, alternatively, comprise more than one lens, or may have a curvature on one surface of an order higher than the second order, and be made of gelatinisable or other material other than glass, e.g. as described in Specification 550,644. One or more of the mirrors 17, 18, 19 may be replaced by a reflecting prism surface.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB308942A GB551391A (en) | 1942-03-09 | 1942-03-09 | Improvements in or relating to variable power telescopes |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB308942A GB551391A (en) | 1942-03-09 | 1942-03-09 | Improvements in or relating to variable power telescopes |
Publications (1)
Publication Number | Publication Date |
---|---|
GB551391A true GB551391A (en) | 1943-02-19 |
Family
ID=9751745
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB308942A Expired GB551391A (en) | 1942-03-09 | 1942-03-09 | Improvements in or relating to variable power telescopes |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB551391A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS51108648U (en) * | 1975-02-27 | 1976-08-31 | ||
GB2214656A (en) * | 1987-11-27 | 1989-09-06 | Marconi Gec Ltd | Optical system for steering fields of view. |
-
1942
- 1942-03-09 GB GB308942A patent/GB551391A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS51108648U (en) * | 1975-02-27 | 1976-08-31 | ||
GB2214656A (en) * | 1987-11-27 | 1989-09-06 | Marconi Gec Ltd | Optical system for steering fields of view. |
US4950056A (en) * | 1987-11-27 | 1990-08-21 | Gec-Marconi Limited | Optical system |
GB2214656B (en) * | 1987-11-27 | 1991-08-21 | Marconi Gec Ltd | Optical systems |
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