JPS56116020A - Correction system for aperture control of single-lens reflex camera providing interchange of lens and interchangeable lens used for its system - Google Patents

Correction system for aperture control of single-lens reflex camera providing interchange of lens and interchangeable lens used for its system

Info

Publication number
JPS56116020A
JPS56116020A JP1996680A JP1996680A JPS56116020A JP S56116020 A JPS56116020 A JP S56116020A JP 1996680 A JP1996680 A JP 1996680A JP 1996680 A JP1996680 A JP 1996680A JP S56116020 A JPS56116020 A JP S56116020A
Authority
JP
Japan
Prior art keywords
lens
aperture
output
circuit
sent
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
JP1996680A
Other languages
Japanese (ja)
Inventor
Fumio Urano
Zenichi Okura
Masahiro Kawasaki
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.)
Pentax Corp
Original Assignee
Asahi Kogaku Kogyo Co 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 Asahi Kogaku Kogyo Co Ltd filed Critical Asahi Kogaku Kogyo Co Ltd
Priority to JP1996680A priority Critical patent/JPS56116020A/en
Priority to DE19813105893 priority patent/DE3105893C2/en
Publication of JPS56116020A publication Critical patent/JPS56116020A/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
    • G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
    • G03B7/20—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly in accordance with change of lens

Landscapes

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

Abstract

PURPOSE: To exercise exposure control of high precision by adjusting aperture operation by substituting an open-aperture value varying with an interchangeable lens and the difference of every lens due to a film surface illuminance error and photodetection part illuminance error with the resistance value of a resistor.
CONSTITUTION: The output of photodetector PE at object brightness Bv is logarithmically compressed by Bv' generating circuit C1, whose output is sent to arithmetic circuit C2 and processed by using shutter speed Tv and film speed Sv from circuits C3 and C4, and its output is sent to arithmetic circuit C12. Through the mount part of each lens, corrected resistance value ΔRv that corresponds to the difference of each lens is sent from electricity quantity correcting member C11 to arithmetic circuit C12 to make a correction. Its output is compared by comparing circuit C13 with aperture value signal Pv and when the both agree with each other, the aperture control is exercised through aperture control circuit C14 and aperture control magnet EEmg. Further, a difference in aperture speed is corrected with minimum diameter signal C6. Consequently, the exposure control of high precision can be exercised.
COPYRIGHT: (C)1981,JPO&Japio
JP1996680A 1980-02-19 1980-02-19 Correction system for aperture control of single-lens reflex camera providing interchange of lens and interchangeable lens used for its system Pending JPS56116020A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP1996680A JPS56116020A (en) 1980-02-19 1980-02-19 Correction system for aperture control of single-lens reflex camera providing interchange of lens and interchangeable lens used for its system
DE19813105893 DE3105893C2 (en) 1980-02-19 1981-02-18 Arrangement for automatic aperture control in a single-lens reflex camera with interchangeable lenses

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1996680A JPS56116020A (en) 1980-02-19 1980-02-19 Correction system for aperture control of single-lens reflex camera providing interchange of lens and interchangeable lens used for its system

Publications (1)

Publication Number Publication Date
JPS56116020A true JPS56116020A (en) 1981-09-11

Family

ID=12013924

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1996680A Pending JPS56116020A (en) 1980-02-19 1980-02-19 Correction system for aperture control of single-lens reflex camera providing interchange of lens and interchangeable lens used for its system

Country Status (2)

Country Link
JP (1) JPS56116020A (en)
DE (1) DE3105893C2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6141229U (en) * 1984-08-20 1986-03-15 オリンパス光学工業株式会社 Camera lens aperture correction device
JP2007282966A (en) * 2006-04-19 2007-11-01 Taiki:Kk Sheet cosmetic material package

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63271239A (en) * 1986-12-05 1988-11-09 Asahi Optical Co Ltd Exposure controller for lens interchangeable type camera

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3486434A (en) * 1966-07-30 1969-12-30 Asahi Optical Co Ltd Lens compensated light measuring system in single lens reflex camera
JPS5397422A (en) * 1977-02-04 1978-08-25 Canon Inc Double priority camera
JPS54108628A (en) * 1978-02-13 1979-08-25 Minolta Camera Co Ltd Information transmission device of lenses

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD130969A1 (en) * 1977-05-20 1978-05-17 Werner Hahn EXPOSURE DEVICE FOR PHOTOGRAPHIC CAMERAS
JPS56107221A (en) * 1980-01-31 1981-08-26 Asahi Optical Co Ltd Correction system for aperture control of single-lens reflex camera with interchangeable lens and its interchangeable lens used for the system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3486434A (en) * 1966-07-30 1969-12-30 Asahi Optical Co Ltd Lens compensated light measuring system in single lens reflex camera
JPS5397422A (en) * 1977-02-04 1978-08-25 Canon Inc Double priority camera
JPS54108628A (en) * 1978-02-13 1979-08-25 Minolta Camera Co Ltd Information transmission device of lenses

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6141229U (en) * 1984-08-20 1986-03-15 オリンパス光学工業株式会社 Camera lens aperture correction device
JP2007282966A (en) * 2006-04-19 2007-11-01 Taiki:Kk Sheet cosmetic material package

Also Published As

Publication number Publication date
DE3105893C2 (en) 1985-12-19
DE3105893A1 (en) 1982-01-28

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