JPS57168237A - Multiple photometric device - Google Patents

Multiple photometric device

Info

Publication number
JPS57168237A
JPS57168237A JP56053131A JP5313181A JPS57168237A JP S57168237 A JPS57168237 A JP S57168237A JP 56053131 A JP56053131 A JP 56053131A JP 5313181 A JP5313181 A JP 5313181A JP S57168237 A JPS57168237 A JP S57168237A
Authority
JP
Japan
Prior art keywords
brightness
value
exposure
minimum
low
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.)
Granted
Application number
JP56053131A
Other languages
Japanese (ja)
Other versions
JPH035569B2 (en
Inventor
Takashi Saegusa
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.)
Nikon Corp
Original Assignee
Nikon Corp
Nippon Kogaku KK
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 Nikon Corp, Nippon Kogaku KK filed Critical Nikon Corp
Priority to JP56053131A priority Critical patent/JPS57168237A/en
Priority to US06/366,073 priority patent/US4429969A/en
Publication of JPS57168237A publication Critical patent/JPS57168237A/en
Publication of JPH035569B2 publication Critical patent/JPH035569B2/ja
Granted 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
    • G03B15/00—Special procedures for taking photographs; Apparatus therefor
    • G03B15/02—Illuminating scene
    • G03B15/03—Combinations of cameras with lighting apparatus; Flash units
    • G03B15/05—Combinations of cameras with electronic flash apparatus; Electronic flash units
    • 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
    • G03B7/08—Control effected solely on the basis of the response, to the intensity of the light received by the camera, of a built-in light-sensitive device
    • G03B7/081—Analogue circuits
    • 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
    • G03B7/28—Circuitry to measure or to take account of the object contrast

Abstract

PURPOSE:To obtain adequate exposure for a low-brightness part even during intense rear light photography, by exercising exposure control on the basis of a work output for low brightness when a difference between the maximum value and minimum value of a photoelectric output is less than a prescribed value in daylight flash photography mode. CONSTITUTION:Maximum brightness Pmax and a reference value Pth are compared mutually at a part 28 and when Pmax>=Pth, a daylight flash photography mode is possible by using a speed light. In this case, when a difference between the maximum brightness and minimum brightness Pmin is less than a prescribed value alpha, the possibility that photography is in an intense rear light state, and exposure with a low brightness part weighted is favorable. For this purpose, only a gate 31 among gates 29-31 is opened to extract and input an adequate internal division value between average brightness Pmean and the minimum brightness to an APEX arithmetic circuit 300 as the output of a multiple photometric arithmetic circuit 200, driving an exposure control part 500.
JP56053131A 1981-04-10 1981-04-10 Multiple photometric device Granted JPS57168237A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP56053131A JPS57168237A (en) 1981-04-10 1981-04-10 Multiple photometric device
US06/366,073 US4429969A (en) 1981-04-10 1982-04-06 Exposure control device of camera for flash exposure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56053131A JPS57168237A (en) 1981-04-10 1981-04-10 Multiple photometric device

Publications (2)

Publication Number Publication Date
JPS57168237A true JPS57168237A (en) 1982-10-16
JPH035569B2 JPH035569B2 (en) 1991-01-25

Family

ID=12934251

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56053131A Granted JPS57168237A (en) 1981-04-10 1981-04-10 Multiple photometric device

Country Status (1)

Country Link
JP (1) JPS57168237A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59114522A (en) * 1982-12-21 1984-07-02 Canon Inc Camera with exposure mode switching device
JPS62189446A (en) * 1986-02-17 1987-08-19 Minolta Camera Co Ltd Display device for camera
JPS6383713A (en) * 1986-09-29 1988-04-14 Nikon Corp Automatic daytime synchro flash system for camera
JPH0220841A (en) * 1988-07-08 1990-01-24 Fuji Photo Film Co Ltd Photometry device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4954027A (en) * 1972-09-25 1974-05-25

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4954027A (en) * 1972-09-25 1974-05-25

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59114522A (en) * 1982-12-21 1984-07-02 Canon Inc Camera with exposure mode switching device
JPH0222929B2 (en) * 1982-12-21 1990-05-22 Canon Kk
JPS62189446A (en) * 1986-02-17 1987-08-19 Minolta Camera Co Ltd Display device for camera
JPS6383713A (en) * 1986-09-29 1988-04-14 Nikon Corp Automatic daytime synchro flash system for camera
JPH0220841A (en) * 1988-07-08 1990-01-24 Fuji Photo Film Co Ltd Photometry device

Also Published As

Publication number Publication date
JPH035569B2 (en) 1991-01-25

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