GB1388081A - Lens assembly - Google Patents

Lens assembly

Info

Publication number
GB1388081A
GB1388081A GB868273A GB868273A GB1388081A GB 1388081 A GB1388081 A GB 1388081A GB 868273 A GB868273 A GB 868273A GB 868273 A GB868273 A GB 868273A GB 1388081 A GB1388081 A GB 1388081A
Authority
GB
United Kingdom
Prior art keywords
lens
lens system
focal length
attachment
systems
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
GB868273A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB1388081A publication Critical patent/GB1388081A/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
    • G02B15/22—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 movable lens means specially adapted for focusing at close distances
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below

Landscapes

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

Abstract

1388081 Optical apparatus &c. K VOCKENHUBER and R HAUSER 22 Feb 1973 [25 Feb 1972] 8682/73 Heading G2J A zoom lens comprises an afocal attachment of variable magnification and composed of four lens systems I, II, III, IV which are spaced from a basic lens system V of fixed focal length, the attachment having its first and fourth lens systems fixed relative to the basic lens system and of positive focal length and the second and third lens systems being axially movable simultaneously but at a varying rate between the first and fourth lens systems and each having a negative focal length, the second lens system being used to vary the focal length of the zoom lens and the third lens system being used to maintain the image position constant; in which attachment the first lens system I is provided, for close focusing of objects, with an axially movable negative lens component Ia disposed in front of a positive lens component Ib which is nearer the basic lens system and which has two lenses Ls, L6 providing an achromatic doublet disposed between two separate positive lenses L4, L 7 each having its face of greater curvature disposed nearer the doublet. Numerical data are given for three embodiments.
GB868273A 1972-02-25 1973-02-22 Lens assembly Expired GB1388081A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT153772A AT316891B (en) 1972-02-25 1972-02-25 Fast lens

Publications (1)

Publication Number Publication Date
GB1388081A true GB1388081A (en) 1975-03-19

Family

ID=3515605

Family Applications (1)

Application Number Title Priority Date Filing Date
GB868273A Expired GB1388081A (en) 1972-02-25 1973-02-22 Lens assembly

Country Status (5)

Country Link
AT (1) AT316891B (en)
DE (1) DE2305353A1 (en)
FR (1) FR2173261B3 (en)
GB (1) GB1388081A (en)
HK (1) HK9376A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5832365B2 (en) * 1974-05-09 1983-07-12 キヤノン株式会社 zoom lens couch
DE29906210U1 (en) 1999-04-07 1999-07-29 Schedlinski, Jürgen, 19294 Niendorf Cleaning device for grills or the like.

Also Published As

Publication number Publication date
FR2173261B3 (en) 1975-03-21
AT316891B (en) 1974-07-25
DE2305353A1 (en) 1973-09-06
FR2173261A1 (en) 1973-10-05
HK9376A (en) 1976-03-05

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Legal Events

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