Exposure control system and a motion picture camera using the sa

Details Exposure control system and a motion picture camera using the sa Exposure control system and a motion picture camera using the sa

1975-06-20

1977-09-06

Adams, Russell E.

Optics: motion pictures

With automatic diaphragm control

352169, 352174, 354 38, 354254, G03B 708, G03B 2138

Patent

active

040464644

ABSTRACT:
An automatic exposure control system for controlling the diaphragm of a motion picture camera in accordance with the object brightness level photoelectrically determined from the amount of light passing through the diaphragm is provided with a manually switchable shutter control device having a number ofswitched positions including positions for selection of various speeds of rotation of the camera shutter and for selection of various shutter intervals each effected in one revolution of the shutter in combination with a corresponding number of branch circuits of the exposure metering device controlling operation of the camera diaphragm, whereby it is made possible to make exposures not only at normal light levels but also at low light levels outside the lower limit of the normal light level range.

REFERENCES:
patent: B349177 (1975-01-01), Iwai et al.
patent: 3603678 (1971-09-01), Anderl et al.
patent: 3705764 (1972-12-01), Reinsch
patent: 3753613 (1973-08-01), Reinsch et al.
patent: 3767298 (1973-10-01), Reinsch
patent: 3825329 (1974-07-01), Heinrich et al.
patent: 3882511 (1975-05-01), Tsujimoto et al.
patent: 3898000 (1975-08-01), Kobayashi et al.
patent: 3964080 (1976-06-01), Maida
patent: 3971053 (1976-07-01), Maida
patent: 3980400 (1976-09-01), Maida

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