NL255488A - - Google Patents

Info

Publication number
NL255488A
NL255488A NL255488DA NL255488A NL 255488 A NL255488 A NL 255488A NL 255488D A NL255488D A NL 255488DA NL 255488 A NL255488 A NL 255488A
Authority
NL
Netherlands
Application number
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.)
Publication of NL255488A publication Critical patent/NL255488A/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
    • G02B15/143—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)
  • Lens Barrels (AREA)
NL255488D 1959-09-03 NL255488A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB30034/59A GB953864A (en) 1959-09-03 1959-09-03 Improvements in or relating to optical objectives of variable focal length

Publications (1)

Publication Number Publication Date
NL255488A true NL255488A (fr)

Family

ID=10301203

Family Applications (2)

Application Number Title Priority Date Filing Date
NL255488D NL255488A (fr) 1959-09-03
NL255490D NL255490A (fr) 1959-09-03

Family Applications After (1)

Application Number Title Priority Date Filing Date
NL255490D NL255490A (fr) 1959-09-03

Country Status (4)

Country Link
US (1) US3191496A (fr)
CH (2) CH380406A (fr)
GB (2) GB953864A (fr)
NL (2) NL255490A (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1260292B (de) * 1966-03-12 1968-02-01 Schneider Co Optische Werke Verstelleinrichtung fuer optische Apparate, insbesondere fuer Objektive mit veraenderlicher Brennweite
US4297007A (en) * 1979-04-24 1981-10-27 Polaroid Corporation Optical apparatus and method for changing a zoom camera to a fixed focus camera
JPS574018A (en) * 1980-06-10 1982-01-09 Konishiroku Photo Ind Co Ltd Focusing system for zoom lens
US5727236A (en) * 1994-06-30 1998-03-10 Frazier; James A. Wide angle, deep field, close focusing optical system
CA2270451A1 (fr) 1998-06-17 1999-12-17 Wolfgang Weigel Systeme optique d'appoint pour appareil photo
JP2012032597A (ja) 2010-07-30 2012-02-16 Canon Inc 光学装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2165341A (en) * 1936-07-28 1939-07-11 Eastman Kodak Co Photographic objective
FR1120271A (fr) * 1955-01-24 1956-07-03 Objectif à longueur focale variable
US2913957A (en) * 1958-06-27 1959-11-24 Frank G Back Varifocal lens assembly
DE1086062B (de) * 1958-09-17 1960-07-28 Zeiss Carl Fa Photographisches Objektiv mit kontinuierlich veraenderlicher Brennweite

Also Published As

Publication number Publication date
CH373905A (fr) 1963-12-15
NL255490A (fr)
GB953864A (en) 1964-04-02
CH380406A (fr) 1964-07-31
US3191496A (en) 1965-06-29
GB953865A (en) 1964-04-02

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