MY7900175A - Improvements in or relating to zoom lenses - Google Patents

Improvements in or relating to zoom lenses

Info

Publication number
MY7900175A
MY7900175A MY175/79A MY7900175A MY7900175A MY 7900175 A MY7900175 A MY 7900175A MY 175/79 A MY175/79 A MY 175/79A MY 7900175 A MY7900175 A MY 7900175A MY 7900175 A MY7900175 A MY 7900175A
Authority
MY
Malaysia
Prior art keywords
relating
zoom lenses
zoom
lenses
Prior art date
Application number
MY175/79A
Other languages
English (en)
Original Assignee
Ponder & Best
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 Ponder & Best filed Critical Ponder & Best
Publication of MY7900175A publication Critical patent/MY7900175A/xx

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
    • G02B15/144—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
    • G02B15/1441—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 positive
    • G02B15/144109—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 positive arranged +--+

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)
  • Lens Barrels (AREA)
MY175/79A 1974-04-19 1979-12-30 Improvements in or relating to zoom lenses MY7900175A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/462,366 US3975089A (en) 1974-04-19 1974-04-19 Zoom lens

Publications (1)

Publication Number Publication Date
MY7900175A true MY7900175A (en) 1979-12-31

Family

ID=23836178

Family Applications (1)

Application Number Title Priority Date Filing Date
MY175/79A MY7900175A (en) 1974-04-19 1979-12-30 Improvements in or relating to zoom lenses

Country Status (6)

Country Link
US (1) US3975089A (enExample)
JP (1) JPS50149360A (enExample)
DE (1) DE2517385A1 (enExample)
GB (1) GB1498727A (enExample)
HK (1) HK14979A (enExample)
MY (1) MY7900175A (enExample)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2533825C3 (de) * 1975-07-29 1979-02-01 Jos. Schneider & Co, Optische Werke, 6550 Bad Kreuznach Entfernungseinstellung bei Objektiven mit veränderbarer Brennweite
JPS5832684B2 (ja) * 1977-07-30 1983-07-14 旭光学工業株式会社 高変倍率を有する広角ズ−ムレンズ系
JPS5576318A (en) * 1978-12-05 1980-06-09 Canon Inc Zoom lens system
US4256381A (en) * 1980-01-31 1981-03-17 Vivitar Corporation Zoom lens
USRE32923E (en) * 1980-01-31 1989-05-16 Vivitar Corporation Zoom lens
JPS56133713A (en) * 1980-03-24 1981-10-20 Asahi Optical Co Ltd Zoom lens
US4634236A (en) * 1980-06-12 1987-01-06 Minolta Camera Kabushiki Kaisha Compact zoom lens system of a relatively high zoom ratio capable of providing a wide field angle
US4466708A (en) * 1981-12-28 1984-08-21 Vivitar Corporation Zoom lens
JPS58150926A (ja) * 1982-03-04 1983-09-07 Canon Inc ズ−ムレンズ
JPS59129818A (ja) * 1983-01-18 1984-07-26 Canon Inc ズ−ムレンズのフオ−カス方法
US4687302A (en) * 1983-06-01 1987-08-18 Canon Kabushiki Kaisha Zoom lens
JPH0690361B2 (ja) * 1984-10-18 1994-11-14 オリンパス光学工業株式会社 ズ−ムレンズ
US4812030A (en) * 1985-01-03 1989-03-14 The Boeing Company Catoptric zoom optical device
FR2580412B1 (fr) * 1985-04-10 1989-02-17 Angenieux P Ets Dispositif d'objectif a focale variable
EP0250686A1 (fr) * 1986-06-26 1988-01-07 Etablissements Pierre Angenieux Dispositif d'objectif à focale variable
US5442485A (en) * 1992-10-15 1995-08-15 Olympus Optical Co., Ltd. Zoom lens system
US6046861A (en) * 1997-10-08 2000-04-04 Vari-Lite. Inc. Zoom lens system having imaging and non-imaging ranges
JP2000121942A (ja) 1998-10-16 2000-04-28 Olympus Optical Co Ltd ズームレンズ

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1277581B (de) * 1965-04-03 1968-09-12 Zeiss Carl Fa Photographisches Objektiv kontinuierlich veraenderbarer Brennweite
US3533678A (en) * 1969-04-03 1970-10-13 Bausch & Lomb Zoom type projection lens system having three movable members and a finite focus
JPS5119983B2 (enExample) * 1972-09-20 1976-06-22

Also Published As

Publication number Publication date
DE2517385A1 (de) 1975-10-30
GB1498727A (en) 1978-01-25
US3975089A (en) 1976-08-17
HK14979A (en) 1979-03-30
JPS50149360A (enExample) 1975-11-29

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