NL255490A - - Google Patents
Info
- Publication number
- NL255490A NL255490A NL255490DA NL255490A NL 255490 A NL255490 A NL 255490A NL 255490D A NL255490D A NL 255490DA NL 255490 A NL255490 A NL 255490A
- Authority
- NL
- Netherlands
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
- G02B15/143—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 three groups only
- G02B15/1431—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 three groups only the first group being positive
- G02B15/143105—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 three groups only the first group being positive arranged +-+
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
- Lens Barrels (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB30034/59A GB953864A (en) | 1959-09-03 | 1959-09-03 | Improvements in or relating to optical objectives of variable focal length |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL255490A true NL255490A (de) |
Family
ID=10301203
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL255490D NL255490A (de) | 1959-09-03 | ||
| NL255488D NL255488A (de) | 1959-09-03 |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL255488D NL255488A (de) | 1959-09-03 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US3191496A (de) |
| CH (2) | CH380406A (de) |
| GB (2) | GB953864A (de) |
| NL (2) | NL255488A (de) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1260292B (de) * | 1966-03-12 | 1968-02-01 | Schneider Co Optische Werke | Verstelleinrichtung fuer optische Apparate, insbesondere fuer Objektive mit veraenderlicher Brennweite |
| US4297007A (en) * | 1979-04-24 | 1981-10-27 | Polaroid Corporation | Optical apparatus and method for changing a zoom camera to a fixed focus camera |
| JPS574018A (en) * | 1980-06-10 | 1982-01-09 | Konishiroku Photo Ind Co Ltd | Focusing system for zoom lens |
| US5727236A (en) * | 1994-06-30 | 1998-03-10 | Frazier; James A. | Wide angle, deep field, close focusing optical system |
| US6212334B1 (en) | 1998-05-02 | 2001-04-03 | Cine Photo Tech, Inc. | Supplementary optical system for a camera |
| JP2012032597A (ja) | 2010-07-30 | 2012-02-16 | Canon Inc | 光学装置 |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2165341A (en) * | 1936-07-28 | 1939-07-11 | Eastman Kodak Co | Photographic objective |
| FR1120271A (fr) * | 1955-01-24 | 1956-07-03 | Objectif à longueur focale variable | |
| US2913957A (en) * | 1958-06-27 | 1959-11-24 | Frank G Back | Varifocal lens assembly |
| DE1086062B (de) * | 1958-09-17 | 1960-07-28 | Zeiss Carl Fa | Photographisches Objektiv mit kontinuierlich veraenderlicher Brennweite |
-
0
- NL NL255490D patent/NL255490A/xx unknown
- NL NL255488D patent/NL255488A/xx unknown
-
1959
- 1959-09-03 GB GB30034/59A patent/GB953864A/en not_active Expired
- 1959-09-03 GB GB30046/59A patent/GB953865A/en not_active Expired
-
1960
- 1960-09-01 US US53413A patent/US3191496A/en not_active Expired - Lifetime
- 1960-09-02 CH CH992360A patent/CH380406A/fr unknown
- 1960-09-02 CH CH992260A patent/CH373905A/fr unknown
Also Published As
| Publication number | Publication date |
|---|---|
| US3191496A (en) | 1965-06-29 |
| CH373905A (fr) | 1963-12-15 |
| GB953865A (en) | 1964-04-02 |
| CH380406A (fr) | 1964-07-31 |
| GB953864A (en) | 1964-04-02 |
| NL255488A (de) |