JPS6474521A - Rear focus type zoom lens - Google Patents

Rear focus type zoom lens

Info

Publication number
JPS6474521A
JPS6474521A JP62232881A JP23288187A JPS6474521A JP S6474521 A JPS6474521 A JP S6474521A JP 62232881 A JP62232881 A JP 62232881A JP 23288187 A JP23288187 A JP 23288187A JP S6474521 A JPS6474521 A JP S6474521A
Authority
JP
Japan
Prior art keywords
group
zoom lens
negative
moving
focus type
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.)
Pending
Application number
JP62232881A
Other languages
Japanese (ja)
Inventor
Koji Oizumi
Keiji Ikemori
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 JP62232881A priority Critical patent/JPS6474521A/en
Publication of JPS6474521A publication Critical patent/JPS6474521A/en
Pending 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
    • G02B15/143—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
    • G02B15/1435—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 the first group being negative
    • G02B15/143503—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 the first group being negative arranged -+-

Landscapes

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

Abstract

PURPOSE:To reduce the fluctuation of an aberration at the time of focusing, and to contrive the miniaturization of the whole lens system by moving at least a second group and a third group among a first negative group, the second positive group and the third negative group, and also, satisfying specific conditions among focal distances of each group and a principal point interval, etc. CONSTITUTION:The titled zoom lens of a rear focus type is constituted of three groups consisting of the first group I of negative refracting power, the second group II of positive refracting power, and the third group III of negative refracting force in order from an object side. Among three lens groups, by moving at least the second group II and the third group III, variable magnification is executed, and by moving at least one of the second group II or the third group III, focusing is executed. Also, when a focal distance of the i-th group, focal distances of the whole system in a wide angle end and a telephoto end, and each principal point interval of the first group and the second group, and the second group and the third group in the wide angle end and the telephoto end are denoted as (fi), and fW, sT, and e1W, e1T, e2W and e2T, respectively, this zoom lens is constituted so as to satisfy the conditional expression.
JP62232881A 1987-09-17 1987-09-17 Rear focus type zoom lens Pending JPS6474521A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62232881A JPS6474521A (en) 1987-09-17 1987-09-17 Rear focus type zoom lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62232881A JPS6474521A (en) 1987-09-17 1987-09-17 Rear focus type zoom lens

Publications (1)

Publication Number Publication Date
JPS6474521A true JPS6474521A (en) 1989-03-20

Family

ID=16946300

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62232881A Pending JPS6474521A (en) 1987-09-17 1987-09-17 Rear focus type zoom lens

Country Status (1)

Country Link
JP (1) JPS6474521A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0392808A (en) * 1989-09-05 1991-04-18 Canon Inc Zoom lens
US5062695A (en) * 1989-02-28 1991-11-05 Minolta Camera Kabushiki Kaisha Zoom lens system for use in a microfilm projection apparatus
JP2001290077A (en) * 2000-04-05 2001-10-19 Nikon Corp Variable focal length lens system
KR20020062826A (en) * 2001-01-24 2002-07-31 아사히 고가쿠 고교 가부시키가이샤 Zoom lens system
JP2007058054A (en) * 2005-08-26 2007-03-08 Canon Inc Zoom lens and imaging apparatus having the same

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5062695A (en) * 1989-02-28 1991-11-05 Minolta Camera Kabushiki Kaisha Zoom lens system for use in a microfilm projection apparatus
JPH0392808A (en) * 1989-09-05 1991-04-18 Canon Inc Zoom lens
JP2001290077A (en) * 2000-04-05 2001-10-19 Nikon Corp Variable focal length lens system
KR20020062826A (en) * 2001-01-24 2002-07-31 아사히 고가쿠 고교 가부시키가이샤 Zoom lens system
JP2007058054A (en) * 2005-08-26 2007-03-08 Canon Inc Zoom lens and imaging apparatus having the same

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