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JPS54135546A - Lens system for mounting and dismounting auxiliary lens - Google Patents

Lens system for mounting and dismounting auxiliary lens

Info

Publication number
JPS54135546A
JPS54135546A JP4356578A JP4356578A JPS54135546A JP S54135546 A JPS54135546 A JP S54135546A JP 4356578 A JP4356578 A JP 4356578A JP 4356578 A JP4356578 A JP 4356578A JP S54135546 A JPS54135546 A JP S54135546A
Authority
JP
Japan
Prior art keywords
lens
lens group
main point
side main
auxiliary lens
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
JP4356578A
Other languages
Japanese (ja)
Other versions
JPS6140965B2 (en
Inventor
Kazuo Tanaka
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 JP4356578A priority Critical patent/JPS54135546A/en
Priority to US06/028,442 priority patent/US4318592A/en
Publication of JPS54135546A publication Critical patent/JPS54135546A/en
Publication of JPS6140965B2 publication Critical patent/JPS6140965B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Lenses (AREA)

Abstract

PURPOSE: To obviate degradation of aberrations despite mounting of an auxiliary lens by making the refractive power of the auxiliary lens positive and so mounting the auxiliary lens that the front side main point of the mounted auxiliary lens comes before the rear side main point of the second lens group.
CONSTITUTION: From the front, a first lens group 10, a second lens group 11 having its front side main point behind its rear side main point and a third lens group 12 are subsequently disposed. An auxiliary lens 14 is removably provided between the second lens group 11 and third lens group 12. When the auxiliary lens 14 is inserted, the focal length range shifts to the long focus side while the image plane position is held maintained. By making the refractive power of the auxiliary lens positive and so constituting the same that the front side main point of the auxiliary lens 14 comes before the rear side main point of the second lens group 11, degradation in aberrations is obviated.
COPYRIGHT: (C)1979,JPO&Japio
JP4356578A 1978-04-13 1978-04-13 Lens system for mounting and dismounting auxiliary lens Granted JPS54135546A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP4356578A JPS54135546A (en) 1978-04-13 1978-04-13 Lens system for mounting and dismounting auxiliary lens
US06/028,442 US4318592A (en) 1978-04-13 1979-04-09 Lens system with attachment lens removably attached

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4356578A JPS54135546A (en) 1978-04-13 1978-04-13 Lens system for mounting and dismounting auxiliary lens

Publications (2)

Publication Number Publication Date
JPS54135546A true JPS54135546A (en) 1979-10-20
JPS6140965B2 JPS6140965B2 (en) 1986-09-12

Family

ID=12667257

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4356578A Granted JPS54135546A (en) 1978-04-13 1978-04-13 Lens system for mounting and dismounting auxiliary lens

Country Status (1)

Country Link
JP (1) JPS54135546A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56111825A (en) * 1980-02-08 1981-09-03 Canon Inc Lens system with function of varying focal length easily
JPS5784417A (en) * 1980-11-13 1982-05-26 Canon Inc Optical system for focal length conversion
US5668666A (en) * 1995-01-05 1997-09-16 Nikon Corporation Zoom lens with an anamorphic converter

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56111825A (en) * 1980-02-08 1981-09-03 Canon Inc Lens system with function of varying focal length easily
JPS6146808B2 (en) * 1980-02-08 1986-10-16 Canon Kk
JPS5784417A (en) * 1980-11-13 1982-05-26 Canon Inc Optical system for focal length conversion
US5668666A (en) * 1995-01-05 1997-09-16 Nikon Corporation Zoom lens with an anamorphic converter

Also Published As

Publication number Publication date
JPS6140965B2 (en) 1986-09-12

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