GB646409A - Improvements in or relating to variable magnification optical systems - Google Patents

Improvements in or relating to variable magnification optical systems

Info

Publication number
GB646409A
GB646409A GB17908/48A GB1790848A GB646409A GB 646409 A GB646409 A GB 646409A GB 17908/48 A GB17908/48 A GB 17908/48A GB 1790848 A GB1790848 A GB 1790848A GB 646409 A GB646409 A GB 646409A
Authority
GB
United Kingdom
Prior art keywords
relating
optical systems
variable magnification
magnification optical
variable
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
GB17908/48A
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.)
W Watson and Sons Ltd
Original Assignee
W Watson and Sons 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
Application filed by W Watson and Sons Ltd filed Critical W Watson and Sons Ltd
Priority to GB17908/48A priority Critical patent/GB646409A/en
Publication of GB646409A publication Critical patent/GB646409A/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
    • G02B15/144—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)
GB17908/48A 1948-07-02 1948-07-02 Improvements in or relating to variable magnification optical systems Expired GB646409A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB17908/48A GB646409A (en) 1948-07-02 1948-07-02 Improvements in or relating to variable magnification optical systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB17908/48A GB646409A (en) 1948-07-02 1948-07-02 Improvements in or relating to variable magnification optical systems

Publications (1)

Publication Number Publication Date
GB646409A true GB646409A (en) 1950-11-22

Family

ID=10103365

Family Applications (1)

Application Number Title Priority Date Filing Date
GB17908/48A Expired GB646409A (en) 1948-07-02 1948-07-02 Improvements in or relating to variable magnification optical systems

Country Status (1)

Country Link
GB (1) GB646409A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1032571B (en) * 1950-07-18 1958-06-19 Watson & Sons Ltd W Optical system used to generate an image of continuously changing size of an object at a fixed distance from the system
US3350155A (en) * 1963-10-16 1967-10-31 Schneider Co Optische Werke Varifocal objective system
DE1264095B (en) * 1964-01-09 1968-03-21 Schneider Co Optische Werke Bright set lens with at least one interchangeable system part

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1032571B (en) * 1950-07-18 1958-06-19 Watson & Sons Ltd W Optical system used to generate an image of continuously changing size of an object at a fixed distance from the system
US3350155A (en) * 1963-10-16 1967-10-31 Schneider Co Optische Werke Varifocal objective system
DE1264095B (en) * 1964-01-09 1968-03-21 Schneider Co Optische Werke Bright set lens with at least one interchangeable system part

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