GB1450633A - Exposure control system - Google Patents

Exposure control system

Info

Publication number
GB1450633A
GB1450633A GB2563174A GB2563174A GB1450633A GB 1450633 A GB1450633 A GB 1450633A GB 2563174 A GB2563174 A GB 2563174A GB 2563174 A GB2563174 A GB 2563174A GB 1450633 A GB1450633 A GB 1450633A
Authority
GB
United Kingdom
Prior art keywords
exposure
subject
distances
exposure time
apertures
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
GB2563174A
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.)
Polaroid Corp
Original Assignee
Polaroid Corp
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 Polaroid Corp filed Critical Polaroid Corp
Publication of GB1450633A publication Critical patent/GB1450633A/en
Expired 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
    • G03B9/00—Exposure-making shutters; Diaphragms
    • G03B9/70—Exposure-making shutters; Diaphragms with flash-synchronising contacts
    • 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
    • G03B7/16—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly in accordance with both the intensity of the flash source and the distance of the flash source from the object, e.g. in accordance with the "guide number" of the flash bulb and the focusing of the camera

Abstract

1450633 Cameras POLAROID CORP 10 June 1974 [5 July 1973] 25631/74 Heading G2 A A camera, when used for flash photography, has its exposure aperture and exposure time set in dependence on the focusing of the lens such that, at predetermined intermediate subject distances (typically around 4 feet) the exposure time lasts for most of the flash illumination interval and, for a given subject, is larger than the exposure times at slightly greater and slightly smaller distances. As shown, shutter-diaphragm blades 24, 26 open to an extent dependant on a follow-focus arrangement Figs. 3, 4, 5 (not shown), whereby apertures 36, 38 define on exposure aperture dependant on subject distances and apertures 56, 58 define a photo-cell aperture dependant on subject distance to control an exposure time determining light integrating unit; apertures 56, 58 being shaped to provide the required exposure time control at subject distances around 4 feet. It is stated that such control is necessary because at intermediate subject distances neither the subject nor the background dominates the exposure and the integrating unit tends to produce erroneous exposure times. By utilizing most of the flash illumination interval, the effect of such errors is reduced.
GB2563174A 1973-07-05 1974-06-10 Exposure control system Expired GB1450633A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US37651373A 1973-07-05 1973-07-05

Publications (1)

Publication Number Publication Date
GB1450633A true GB1450633A (en) 1976-09-22

Family

ID=23485320

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2563174A Expired GB1450633A (en) 1973-07-05 1974-06-10 Exposure control system

Country Status (6)

Country Link
JP (1) JPS5724527B2 (en)
AU (1) AU498429B2 (en)
CA (1) CA1020790A (en)
DE (1) DE2432481C2 (en)
FR (1) FR2236203B1 (en)
GB (1) GB1450633A (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3977014A (en) * 1975-03-03 1976-08-24 Polaroid Corporation Follow focus exposure control system with improved uniform trim control
US3972057A (en) * 1975-03-03 1976-07-27 Polaroid Corporation Exposure control system with follow focus capability
US3995295A (en) * 1975-08-28 1976-11-30 Polaroid Corporation Electro-mechanical shutter system having mechanical latch
US4104653A (en) * 1977-05-31 1978-08-01 Polaroid Corporation Scanning shutter blade arrangement with ambient and flash ranges
US4255030A (en) * 1979-09-13 1981-03-10 Polaroid Corporation Camera with proportional fill flash quench strobe
US4299461A (en) * 1980-03-31 1981-11-10 Polaroid Corporation Exposure and flash fire control system

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1290805U (en) *
DE1290805B (en) * 1960-09-23 1969-03-13 Leczkowski Kurt Automatic exposure control for recordings with photographic cameras in mixed light
DE1806487A1 (en) * 1968-10-31 1970-05-14 Agfa Gevaert Ag Photographic camera
GB1391292A (en) * 1971-08-03 1975-04-23 Polaroid Corp Photographic exposure control systems

Also Published As

Publication number Publication date
FR2236203A1 (en) 1975-01-31
AU498429B2 (en) 1979-03-15
FR2236203B1 (en) 1979-08-03
DE2432481A1 (en) 1975-01-23
JPS5034535A (en) 1975-04-02
AU7054374A (en) 1976-01-08
DE2432481C2 (en) 1986-04-30
CA1020790A (en) 1977-11-15
JPS5724527B2 (en) 1982-05-25

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Legal Events

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

Effective date: 19920610