GB1126069A - Wide angle zoom lens system - Google Patents
Wide angle zoom lens systemInfo
- Publication number
- GB1126069A GB1126069A GB38940/65A GB3894065A GB1126069A GB 1126069 A GB1126069 A GB 1126069A GB 38940/65 A GB38940/65 A GB 38940/65A GB 3894065 A GB3894065 A GB 3894065A GB 1126069 A GB1126069 A GB 1126069A
- Authority
- GB
- United Kingdom
- Prior art keywords
- group
- focal length
- negative
- max
- cemented
- 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
- G02B15/146—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 more than five groups
- G02B15/1461—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 more than five groups the first group being positive
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
1,126,069. Zoom lenses. CANON CAMERA CO. Inc. Sept. 13, 1965 [Sept. 15, 1964], No.38940/65. Heading G2J. A zoom lens has a divergent group I which is movable only for focusing, a fixed converging group II, a movable divergent group III, a movable divergent group IV, aperture stop AS, and fixed convergent groups V, VI, wherein: - 1. The focal length of group V is so chosen that the equivalent focal length of groups I to V combined is always negative throughout the zoom range and the absolute value thereof at the shortest focal length position is between 1À5 and 2À5 times the minimum focal length of the zoom lens f min . and the focal length of group III lies in the range 2À2 to 1À6 times f min . 2. The absolute value of the focal length (f F ) of group I is less than 1/1À3 of the maximum focal length of the zoom lens f max . the focal length f fr of group II is less than 1/1À3 of |f F | , the spacing between the second principal point of group I and the first principal point of group II is between 0À23 and 0À33 times f max . and the combined focal length of groups I and II is between 3/5 f max . and f max. 3. The refractive index of the glass of each lens of group III is greater than 1À8 and of group IV greater than 1À7, the refractive index of each negative element in group I is greater than 1À65 and that of each positive element in group II, V is less than 1À55. 4. At least two negative elements are included in group II, the difference in their Abbe numbers from those of the positive elements in the group being at least 35, each such negative element being cemented to a positive element such that the centres of curvature of the cemented surfaces are located at points on the optical axis which are on the same side of the cemented surface as the point at which a marginal light ray incident upon the cemented surface and which reaches the centre of the image surface, or the extension of such a ray, crosses the axis. 5. Group V has at least one positive singlet and one negative singlet, and in group VI there are at least two bi-convex doublets, the cemented surface of each being divergent with its centre of curvature on the opposite side of the stop from the point at which such surface crosses the optical axis. Optical data are provided for the example shown.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5276764 | 1964-09-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1126069A true GB1126069A (en) | 1968-09-05 |
Family
ID=12924009
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB38940/65A Expired GB1126069A (en) | 1964-09-15 | 1965-09-13 | Wide angle zoom lens system |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1126069A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1394591A1 (en) * | 2002-08-28 | 2004-03-03 | Canon Kabushiki Kaisha | Zoom lens and image pickup apparatus |
-
1965
- 1965-09-13 GB GB38940/65A patent/GB1126069A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1394591A1 (en) * | 2002-08-28 | 2004-03-03 | Canon Kabushiki Kaisha | Zoom lens and image pickup apparatus |
| US6825990B2 (en) | 2002-08-28 | 2004-11-30 | Canon Kabushiki Kaisha | Zoom lens and image pickup apparatus |
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