GB1203506A - Improvements relating to zoom lenses - Google Patents
Improvements relating to zoom lensesInfo
- Publication number
- GB1203506A GB1203506A GB30919/68A GB3091968A GB1203506A GB 1203506 A GB1203506 A GB 1203506A GB 30919/68 A GB30919/68 A GB 30919/68A GB 3091968 A GB3091968 A GB 3091968A GB 1203506 A GB1203506 A GB 1203506A
- Authority
- GB
- United Kingdom
- Prior art keywords
- group
- negative
- positive
- lenses
- 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
- G02B15/14—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
- G02B15/145—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 five groups only
- G02B15/1451—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 five groups only the first group being positive
- G02B15/145125—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 five groups only the first group being positive arranged +--++
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
1,203,506. Zoom lenses. JOS. SCHNEIDER & CO. OPTISCHE WERKE. June 28, 1968 [June 30, 1967], No.30919/68. Heading G2J. A zoom lens has a front fixed positive group I, a movable negative group II, a movable negative group III, a fixed positive group IV and a fixed basic group V wherein:- (a) the focal length of group IV is less than 75% of that of group I and the focal length of group m is greater by at least 10% than the focal length of group II; (b) the focal length of group 1 is less than four times that of group V; (c) group II consists of negative meniscus L8 and a negative cemented component L 9 -L 11 (d) group III is a negative component formed of two lenses L 12 , L 13 of opposite power. (e) group IV consists of two positive lenses L 14 L 15 : and (f) group V consists of a negative cemented component formed of two lenses L 16 , L 17 , two positive elements L 18 , L 19 , a negative element L 70 , a positive lens L 21 , and a positive component formed of two lenses L 22 , L 23 . Optical dates are provided for three examples.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1572855 | 1967-06-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1203506A true GB1203506A (en) | 1970-08-26 |
Family
ID=5678529
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB30919/68A Expired GB1203506A (en) | 1967-06-30 | 1968-06-28 | Improvements relating to zoom lenses |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1203506A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2390704A1 (en) * | 2010-05-26 | 2011-11-30 | Canon Kabushiki Kaisha | Zoom lens and image pickup apparatus including the same |
-
1968
- 1968-06-28 GB GB30919/68A patent/GB1203506A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2390704A1 (en) * | 2010-05-26 | 2011-11-30 | Canon Kabushiki Kaisha | Zoom lens and image pickup apparatus including the same |
| US8358470B2 (en) | 2010-05-26 | 2013-01-22 | Canon Kabushiki Kaisha | Zoom lens and image pickup apparatus including the same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |