JPS5778514A - Zoom lens system - Google Patents

Zoom lens system

Info

Publication number
JPS5778514A
JPS5778514A JP55154051A JP15405180A JPS5778514A JP S5778514 A JPS5778514 A JP S5778514A JP 55154051 A JP55154051 A JP 55154051A JP 15405180 A JP15405180 A JP 15405180A JP S5778514 A JPS5778514 A JP S5778514A
Authority
JP
Japan
Prior art keywords
group
lens
fixed
variator
compensator
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
JP55154051A
Other languages
Japanese (ja)
Other versions
JPH0125044B2 (en
Inventor
Hisayuki Masumoto
Masaichi Shimomura
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.)
Minolta Co Ltd
Original Assignee
Minolta Co Ltd
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 Minolta Co Ltd filed Critical Minolta Co Ltd
Priority to JP55154051A priority Critical patent/JPS5778514A/en
Priority to US06/318,144 priority patent/US4492437A/en
Publication of JPS5778514A publication Critical patent/JPS5778514A/en
Publication of JPH0125044B2 publication Critical patent/JPH0125044B2/ja
Granted legal-status Critical Current

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
    • G02B15/16—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
    • 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
    • G02B15/143—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 three groups only

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Lenses (AREA)

Abstract

PURPOSE:To realize in-focus state to an approximate object, by shifting a negative lens group at the back of a fixed rear group in a system comprising a fixed front group, a magnification and reduction lens group containing a variator and a compensator and the above-mentioned fixed rear group respectively. CONSTITUTION:A zoom lens system comprising a fixed front groupI, a magnification and reduction lens group II including a variator and a compensator and a fixed rear group II which is fixed as a whole and contains a diaphragm S at its front or inside part in that order from the side of an object. A mobile lens F having the negative refractive power is provided at the side of an image from the diaphragm S in the group III, and this lens F is shifted toward the image to perform the focusing to the side of an approximate object. The ratio between the absolute value of the focal distance fF of the lens F and the focal distance of the group III is set at 0.1-2. Thus a well-balanced compensation is possible for the aberration fluctuation caused by the focusing.
JP55154051A 1980-11-04 1980-11-04 Zoom lens system Granted JPS5778514A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP55154051A JPS5778514A (en) 1980-11-04 1980-11-04 Zoom lens system
US06/318,144 US4492437A (en) 1980-11-04 1981-11-04 Zoom lens system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55154051A JPS5778514A (en) 1980-11-04 1980-11-04 Zoom lens system

Publications (2)

Publication Number Publication Date
JPS5778514A true JPS5778514A (en) 1982-05-17
JPH0125044B2 JPH0125044B2 (en) 1989-05-16

Family

ID=15575833

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55154051A Granted JPS5778514A (en) 1980-11-04 1980-11-04 Zoom lens system

Country Status (1)

Country Link
JP (1) JPS5778514A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5913212A (en) * 1982-07-14 1984-01-24 Canon Inc Zoom lens
JPS5955538U (en) * 1982-10-05 1984-04-11 住友ベークライト株式会社 Medical composite tube
JPS59129818A (en) * 1983-01-18 1984-07-26 Canon Inc Zoom lens focusing method
JPS6243615A (en) * 1985-08-22 1987-02-25 Canon Inc Zoom lens with large aperture ratio
WO2013099210A1 (en) * 2011-12-27 2013-07-04 富士フイルム株式会社 Zoom lens and imaging device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4832387A (en) * 1971-08-31 1973-04-28

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4832387A (en) * 1971-08-31 1973-04-28

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5913212A (en) * 1982-07-14 1984-01-24 Canon Inc Zoom lens
JPS5955538U (en) * 1982-10-05 1984-04-11 住友ベークライト株式会社 Medical composite tube
JPS59129818A (en) * 1983-01-18 1984-07-26 Canon Inc Zoom lens focusing method
JPS6243615A (en) * 1985-08-22 1987-02-25 Canon Inc Zoom lens with large aperture ratio
WO2013099210A1 (en) * 2011-12-27 2013-07-04 富士フイルム株式会社 Zoom lens and imaging device
JP5583864B2 (en) * 2011-12-27 2014-09-03 富士フイルム株式会社 Zoom lens and imaging device
US9013805B2 (en) 2011-12-27 2015-04-21 Fujifilm Corporation Zoom lens and imaging apparatus

Also Published As

Publication number Publication date
JPH0125044B2 (en) 1989-05-16

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