JPS55164805A - Reverse telephoto type wide-angle lens - Google Patents
Reverse telephoto type wide-angle lensInfo
- Publication number
- JPS55164805A JPS55164805A JP7290479A JP7290479A JPS55164805A JP S55164805 A JPS55164805 A JP S55164805A JP 7290479 A JP7290479 A JP 7290479A JP 7290479 A JP7290479 A JP 7290479A JP S55164805 A JPS55164805 A JP S55164805A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- lenses
- conditions
- specify
- 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.)
- Granted
Links
Abstract
PURPOSE: To obtain the single-lens reflex camera of back focus longer than its focal length and a small size by letting the lens composed of single lenses or cemented lenses of the 1stW9th lenses from the object side and satisfying the specified conditions.
CONSTITUTION: The lens consists of single lenses or cemented lenses L1WL9 of the 1stW9th groups from the object side and the respective lenses are so formed as to satisfy conditions 1W4. The conditions 1 specify the composite focal length of the divergent group constituted by a positive meniscus lens L1, negative meniscus single lenses L2, L3, biconvex single lens L4. The conditions 2, 3 specify the refractive power and shape of the positive meniscus signal lens L5. The conditions 4 specify the air spacing between the lens L5 and biconvex single lens L6. By satisfying these conditins 1W4, the miniature reverse telephoto type wide-angle lens for single-lens reflex cameras of an aperture ratio 1:2.0 or more, an angle of view as wide as 84° and back focus longer than the focal length may be obtained.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7290479A JPS55164805A (en) | 1979-06-08 | 1979-06-08 | Reverse telephoto type wide-angle lens |
US06/151,445 US4382662A (en) | 1979-06-08 | 1980-05-19 | Inverted telephoto type wide angle lens system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7290479A JPS55164805A (en) | 1979-06-08 | 1979-06-08 | Reverse telephoto type wide-angle lens |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55164805A true JPS55164805A (en) | 1980-12-22 |
JPS6232763B2 JPS6232763B2 (en) | 1987-07-16 |
Family
ID=13502794
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7290479A Granted JPS55164805A (en) | 1979-06-08 | 1979-06-08 | Reverse telephoto type wide-angle lens |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55164805A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3932634A1 (en) * | 1988-09-30 | 1990-04-05 | Asahi Optical Co Ltd | RETROFOCUS WIDE-ANGLE LENS SYSTEM |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4912822A (en) * | 1972-05-10 | 1974-02-04 | ||
JPS5339759A (en) * | 1976-09-22 | 1978-04-11 | Asahi Optical Co Ltd | Small sized bright wide zoom lens |
JPS53135658A (en) * | 1977-04-30 | 1978-11-27 | Asahi Optical Co Ltd | Zoom lens including ultraawide lens |
JPS5415733A (en) * | 1977-06-10 | 1979-02-05 | Asahi Optical Co Ltd | Lowwmagnification variableeangleelens system |
-
1979
- 1979-06-08 JP JP7290479A patent/JPS55164805A/en active Granted
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4912822A (en) * | 1972-05-10 | 1974-02-04 | ||
JPS5339759A (en) * | 1976-09-22 | 1978-04-11 | Asahi Optical Co Ltd | Small sized bright wide zoom lens |
JPS53135658A (en) * | 1977-04-30 | 1978-11-27 | Asahi Optical Co Ltd | Zoom lens including ultraawide lens |
JPS5415733A (en) * | 1977-06-10 | 1979-02-05 | Asahi Optical Co Ltd | Lowwmagnification variableeangleelens system |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3932634A1 (en) * | 1988-09-30 | 1990-04-05 | Asahi Optical Co Ltd | RETROFOCUS WIDE-ANGLE LENS SYSTEM |
Also Published As
Publication number | Publication date |
---|---|
JPS6232763B2 (en) | 1987-07-16 |
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