GB2246879B - A zoom lens system with a macro system - Google Patents

A zoom lens system with a macro system

Info

Publication number
GB2246879B
GB2246879B GB9121829A GB9121829A GB2246879B GB 2246879 B GB2246879 B GB 2246879B GB 9121829 A GB9121829 A GB 9121829A GB 9121829 A GB9121829 A GB 9121829A GB 2246879 B GB2246879 B GB 2246879B
Authority
GB
United Kingdom
Prior art keywords
zoom lens
macro
lens system
macro system
zoom
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 - Lifetime
Application number
GB9121829A
Other versions
GB9121829D0 (en
GB2246879A (en
Inventor
Takayuki Ito
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.)
Pentax Corp
Original Assignee
Asahi Kogaku Kogyo 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
Priority claimed from JP33646087A external-priority patent/JPH01178912A/en
Priority claimed from JP63129532A external-priority patent/JP2736893B2/en
Application filed by Asahi Kogaku Kogyo Co Ltd filed Critical Asahi Kogaku Kogyo Co Ltd
Priority to GB9121829A priority Critical patent/GB2246879B/en
Publication of GB9121829D0 publication Critical patent/GB9121829D0/en
Publication of GB2246879A publication Critical patent/GB2246879A/en
Application granted granted Critical
Publication of GB2246879B publication Critical patent/GB2246879B/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • G02B15/1431—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 positive
    • G02B15/143105—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 positive arranged +-+

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)
GB9121829A 1987-12-29 1991-10-15 A zoom lens system with a macro system Expired - Lifetime GB2246879B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9121829A GB2246879B (en) 1987-12-29 1991-10-15 A zoom lens system with a macro system

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP33646087A JPH01178912A (en) 1987-12-29 1987-12-29 Compact high variable power rate zoom lens covering wide angle
JP63129532A JP2736893B2 (en) 1988-05-27 1988-05-27 Macro system of high zoom lens with wide angle
GB9121829A GB2246879B (en) 1987-12-29 1991-10-15 A zoom lens system with a macro system

Publications (3)

Publication Number Publication Date
GB9121829D0 GB9121829D0 (en) 1991-11-27
GB2246879A GB2246879A (en) 1992-02-12
GB2246879B true GB2246879B (en) 1992-10-07

Family

ID=27265888

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9121829A Expired - Lifetime GB2246879B (en) 1987-12-29 1991-10-15 A zoom lens system with a macro system

Country Status (1)

Country Link
GB (1) GB2246879B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6003530B2 (en) 2012-10-25 2016-10-05 リコーイメージング株式会社 Zoom lens system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4749265A (en) * 1983-07-14 1988-06-07 Canon Kabushiki Kaisha Zoom lens

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4749265A (en) * 1983-07-14 1988-06-07 Canon Kabushiki Kaisha Zoom lens

Also Published As

Publication number Publication date
GB9121829D0 (en) 1991-11-27
GB2246879A (en) 1992-02-12

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Legal Events

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

Effective date: 20051229