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 prevented

Info

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
Application number
JP15024479A
Other languages
Japanese (ja)
Other versions
JPS636849B2 (en
Inventor
Kazuo Tanaka
Sadahiko Tsuji
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Priority to JP15024479A priority Critical patent/JPS5672411A/en
Priority to DE19792950951 priority patent/DE2950951A1/en
Priority to US06/105,089 priority patent/US4336983A/en
Publication of JPS5672411A publication Critical patent/JPS5672411A/en
Publication of JPS636849B2 publication Critical patent/JPS636849B2/ja
Granted legal-status Critical Current

Links

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  • 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
JP15024479A 1978-11-25 1979-11-20 Zoom lens with focusing function having change in angle of view prevented Granted JPS5672411A (en)

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)

Also Published As

Publication number Publication date
JPS636849B2 (en) 1988-02-12

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