GB2080966B - A zoom lens of high vari-focal ratio having negative front lens group - Google Patents

A zoom lens of high vari-focal ratio having negative front lens group

Info

Publication number
GB2080966B
GB2080966B GB8118682A GB8118682A GB2080966B GB 2080966 B GB2080966 B GB 2080966B GB 8118682 A GB8118682 A GB 8118682A GB 8118682 A GB8118682 A GB 8118682A GB 2080966 B GB2080966 B GB 2080966B
Authority
GB
United Kingdom
Prior art keywords
focal ratio
lens group
negative front
zoom lens
high vari
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.)
Expired
Application number
GB8118682A
Other versions
GB2080966A (en
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.)
Konica Minolta Inc
Original Assignee
Konica Minolta 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 Konica Minolta Inc filed Critical Konica Minolta Inc
Publication of GB2080966A publication Critical patent/GB2080966A/en
Application granted granted Critical
Publication of GB2080966B publication Critical patent/GB2080966B/en
Expired 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
    • G02B15/177—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 having a negative front lens or group of lenses
    • 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
    • G02B15/144—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 four groups only
    • G02B15/1445—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 four groups only the first group being negative
    • G02B15/144511—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 four groups only the first group being negative arranged -+-+

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Lenses (AREA)
GB8118682A 1980-06-24 1981-06-17 A zoom lens of high vari-focal ratio having negative front lens group Expired GB2080966B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8455580A JPS5711315A (en) 1980-06-24 1980-06-24 Zoom lens with highly variable magnification preceding negative groups

Publications (2)

Publication Number Publication Date
GB2080966A GB2080966A (en) 1982-02-10
GB2080966B true GB2080966B (en) 1984-08-08

Family

ID=13833883

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8118682A Expired GB2080966B (en) 1980-06-24 1981-06-17 A zoom lens of high vari-focal ratio having negative front lens group

Country Status (2)

Country Link
JP (1) JPS5711315A (en)
GB (1) GB2080966B (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5895315A (en) * 1981-11-30 1983-06-06 Minolta Camera Co Ltd High variable magnification zoom lens system containing wide angle area
JPS59214009A (en) * 1983-05-19 1984-12-03 Asahi Optical Co Ltd High variable power zoom lens for definite distance
JP2899005B2 (en) * 1989-01-30 1999-06-02 キヤノン株式会社 Zoom lens with built-in focus lens
JP2722709B2 (en) * 1989-09-05 1998-03-09 キヤノン株式会社 Zoom lens
US5264965A (en) * 1991-02-15 1993-11-23 Asahi Kogaku Kogyo Kabushiki Kaisha Zoom lens
JP2000241704A (en) 1999-02-18 2000-09-08 Asahi Optical Co Ltd Zoom lens system
JP3847506B2 (en) * 1999-12-21 2006-11-22 オリンパス株式会社 Zoom lens
JP4289958B2 (en) 2003-09-19 2009-07-01 キヤノン株式会社 Zoom lens and imaging apparatus having the same
US7075730B2 (en) 2004-06-25 2006-07-11 Canon Kabushiki Kaisha Zoom lens system and image pickup apparatus including the same

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5229521B2 (en) * 1972-07-03 1977-08-02
JPS5334539A (en) * 1976-09-13 1978-03-31 Tokina Optical Wide angle high zoom ratio zoom system
JPS54151027A (en) * 1978-05-19 1979-11-27 Sigma Kk Small wide angle zoom lens

Also Published As

Publication number Publication date
GB2080966A (en) 1982-02-10
JPS5711315A (en) 1982-01-21

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19930617