GB817455A - Improvements in or relating to reversible lens attachments - Google Patents
Improvements in or relating to reversible lens attachmentsInfo
- Publication number
- GB817455A GB817455A GB30063/57A GB3006357A GB817455A GB 817455 A GB817455 A GB 817455A GB 30063/57 A GB30063/57 A GB 30063/57A GB 3006357 A GB3006357 A GB 3006357A GB 817455 A GB817455 A GB 817455A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lens
- tube
- doublet
- mount
- focal length
- 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
- G02B15/02—Optical objectives with means for varying the magnification by changing, adding, or subtracting a part of the objective, e.g. convertible objective
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
817,455. Lens attachments. KODAK Ltd. Sept. 25, 1957 [Oct. 1, 1956], No. 30063/57. Classes 97(1) and 98(1) A substantially afocal reversible lens attachment comprises a biconvex doublet 1, 2 of focal length f and a biconcave component (e.g. a simple lens 3) of focal length between-0.7f and-0.9f, the radii of the surfaces R 1 to R 5 being such that 0.7f < + R 1 < 0.9f, 0.6f < -R 2 < f, 1.1f < -R 3 < 1.7f, 0.8f < -R 4 < 1.2f, and 0.85f < + R 5 < 1.3f, the refractive indices N 1 and N 2 of the positive doublet being such that 1.48 < N 1 < 1.57 and 1.58 < N 2 < 1.67, the refractive index N 3 of the negative component or of each element therein being such that 1.58 < N 3 < 1.67, the two components being of substantially equal diameter and being mounted in a lens tube each end of which is relatively detachable to the mount of a standard objective. As shown, the lens tube 51 has a central thread so that either end of the tube can be screwed into a collet 52 having an expandable end 53 for gripping firmly the mount 50 of a standard objective (e.g. in a camera). The negative component may be an achromatic doublet made up of elements having the same refractive index but different AbbÚ numbers.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US817455XA | 1956-10-01 | 1956-10-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB817455A true GB817455A (en) | 1959-07-29 |
Family
ID=22166122
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB30063/57A Expired GB817455A (en) | 1956-10-01 | 1957-09-25 | Improvements in or relating to reversible lens attachments |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB817455A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3116359A (en) * | 1959-03-07 | 1963-12-31 | Isco Optische Werke Gmbh | Front attachment for optical objectives |
WO2009114255A1 (en) * | 2008-03-11 | 2009-09-17 | Bausch & Lomb Incorporated | Device and method for demonstrating optical effects |
FR2941538A1 (en) * | 2009-01-26 | 2010-07-30 | Voxel Electronics Ind | Optical device for forming three-dimensional volume directly visible by spectator in e.g. media application, has intervention units intervening on perception of volume image, and reinforcement units reinforcing perception of volume image |
-
1957
- 1957-09-25 GB GB30063/57A patent/GB817455A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3116359A (en) * | 1959-03-07 | 1963-12-31 | Isco Optische Werke Gmbh | Front attachment for optical objectives |
WO2009114255A1 (en) * | 2008-03-11 | 2009-09-17 | Bausch & Lomb Incorporated | Device and method for demonstrating optical effects |
US7957059B2 (en) | 2008-03-11 | 2011-06-07 | Bausch & Lomb Incorporated | Device and method for demonstrating optical effects |
FR2941538A1 (en) * | 2009-01-26 | 2010-07-30 | Voxel Electronics Ind | Optical device for forming three-dimensional volume directly visible by spectator in e.g. media application, has intervention units intervening on perception of volume image, and reinforcement units reinforcing perception of volume image |
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