JPS57146232A - Camera incorporating plural lenses - Google Patents

Camera incorporating plural lenses

Info

Publication number
JPS57146232A
JPS57146232A JP3188781A JP3188781A JPS57146232A JP S57146232 A JPS57146232 A JP S57146232A JP 3188781 A JP3188781 A JP 3188781A JP 3188781 A JP3188781 A JP 3188781A JP S57146232 A JPS57146232 A JP S57146232A
Authority
JP
Japan
Prior art keywords
lens system
subordinate
light
photodetected
focal length
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.)
Pending
Application number
JP3188781A
Other languages
Japanese (ja)
Inventor
Hideo Igari
Michiro Hirohata
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP3188781A priority Critical patent/JPS57146232A/en
Priority to US06/352,855 priority patent/US4451129A/en
Publication of JPS57146232A publication Critical patent/JPS57146232A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B19/00—Cameras
    • G03B19/02—Still-picture cameras
    • G03B19/04—Roll-film cameras
    • G03B19/07—Roll-film cameras having more than one objective

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Exposure Control For Cameras (AREA)
  • Structure And Mechanism Of Cameras (AREA)

Abstract

PURPOSE:To enable simple constituion to perform exposure compensation which accompanies variation in the F number of a lens with the same aperture during focal length switching, by providing an adjusting method for the quantity of transmitted light together with a subordinate lens system in one body. CONSTITUTION:The 2nd optical barrel 7 of a subordinate lens system is provided with a filter 9 for adjusting the quantity of transmitted light, and when the subordinate lens system and the main lens system of the 1st optical lens barrel 1 are combined together to switch focal length, the quantity of light photodetected by a photometric photodetecting element 11 decreases. Therefore, the quantity of photodetected light which corresponds to an angle of photographic photodetection with the same aperture value and same ratio is detected by the element 11 without interlocking adjustment before and after the focus switching, and exposure compensation which accompanies variation in F number is performed by the simple constitution.
JP3188781A 1981-03-05 1981-03-05 Camera incorporating plural lenses Pending JPS57146232A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP3188781A JPS57146232A (en) 1981-03-05 1981-03-05 Camera incorporating plural lenses
US06/352,855 US4451129A (en) 1981-03-05 1982-02-26 Camera having a plurality of built-in lenses

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3188781A JPS57146232A (en) 1981-03-05 1981-03-05 Camera incorporating plural lenses

Publications (1)

Publication Number Publication Date
JPS57146232A true JPS57146232A (en) 1982-09-09

Family

ID=12343538

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3188781A Pending JPS57146232A (en) 1981-03-05 1981-03-05 Camera incorporating plural lenses

Country Status (1)

Country Link
JP (1) JPS57146232A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59176008U (en) * 1983-05-10 1984-11-24 キヤノン株式会社 Camera focal length variable device
JPS61156109A (en) * 1984-12-28 1986-07-15 Sigma:Kk Auxiliary telephoto lens device
JPS61259242A (en) * 1985-05-14 1986-11-17 Konishiroku Photo Ind Co Ltd Electrically driven focal length changeover camera
JPS62173735U (en) * 1986-04-25 1987-11-05
JPS6352125A (en) * 1986-08-22 1988-03-05 Nikon Corp Multi-functional two-focus camera

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59176008U (en) * 1983-05-10 1984-11-24 キヤノン株式会社 Camera focal length variable device
JPS6347865Y2 (en) * 1983-05-10 1988-12-09
JPS61156109A (en) * 1984-12-28 1986-07-15 Sigma:Kk Auxiliary telephoto lens device
JPS61259242A (en) * 1985-05-14 1986-11-17 Konishiroku Photo Ind Co Ltd Electrically driven focal length changeover camera
JPH046933B2 (en) * 1985-05-14 1992-02-07 Konishiroku Photo Ind
JPS62173735U (en) * 1986-04-25 1987-11-05
JPH052910Y2 (en) * 1986-04-25 1993-01-25
JPS6352125A (en) * 1986-08-22 1988-03-05 Nikon Corp Multi-functional two-focus camera

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