JPS5672411A - Zoom lens with focusing function having change in angle of view prevented - Google Patents
Zoom lens with focusing function having change in angle of view preventedInfo
- Publication number
- JPS5672411A JPS5672411A JP15024479A JP15024479A JPS5672411A JP S5672411 A JPS5672411 A JP S5672411A JP 15024479 A JP15024479 A JP 15024479A JP 15024479 A JP15024479 A JP 15024479A JP S5672411 A JPS5672411 A JP S5672411A
- Authority
- JP
- Japan
- Prior art keywords
- lens group
- focusing
- angle
- view
- change
- 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
Landscapes
- Lenses (AREA)
Abstract
PURPOSE: To eliminate a change in angle of view during focusing completely by positioning the back focus of a lens system, provided closer to an image surface side than a movable group for focusing, at the field pupil position of the whole lens system.
CONSTITUTION: The 1st lens group 11 movable in focusing from the object field, the 2nd lens group 12 fixed in focusing and the 3rd lens group 13 fixed in focusing are arranged successively and diaphragm 14 is provided between the 2nd lens group 12 and the 3rd lens group 13. When the 1st lens group 11 is moved by distance (x) to focus on object 17 at distance S1 from the 1st lens group 11, the back focus Bf of the optical system consisting of the 2nd lens group 12 and the 3rd lens group 13 in a body agrees with the field pupil 15 position of the whole system and angle ω∞ of view in the reference state becomes equal to angle (ω) of view in focusing.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15024479A JPS5672411A (en) | 1979-11-20 | 1979-11-20 | Zoom lens with focusing function having change in angle of view prevented |
DE19792950951 DE2950951A1 (en) | 1978-12-25 | 1979-12-18 | PHOTOGRAPHIC LENS WITH STABILIZATION AGAINST AN IMAGE ANGLE CHANGE DURING FOCUSING |
US06/105,089 US4336983A (en) | 1978-11-25 | 1979-12-19 | Photographic objective stabilized against change of angular field during focusing |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15024479A JPS5672411A (en) | 1979-11-20 | 1979-11-20 | Zoom lens with focusing function having change in angle of view prevented |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5672411A true JPS5672411A (en) | 1981-06-16 |
JPS636849B2 JPS636849B2 (en) | 1988-02-12 |
Family
ID=15492705
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15024479A Granted JPS5672411A (en) | 1978-11-25 | 1979-11-20 | Zoom lens with focusing function having change in angle of view prevented |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5672411A (en) |
-
1979
- 1979-11-20 JP JP15024479A patent/JPS5672411A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS636849B2 (en) | 1988-02-12 |
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