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Photographic control system for varying both flash fire aperture and exposure termination in correspondence with film speed

  • US 4,355,873 A
  • Filed: 06/08/1981
  • Issued: 10/26/1982
  • Est. Priority Date: 06/08/1981
  • Status: Expired due to Term
First Claim
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1. In a photographic exposure control system for use with a source of artificial illumination and for controlling the exposure of a photosensitive recording medium, the system having a shutter arrangement for at least initially providing progressively increasing aperture values at a predetermined rate during an exposure interval within which scene light is transmitted to the photosensitive medium following actuation of the shutter arrangement, and means for providing a flash fire signal to ignite the source of artificial illumination during the exposure interval at an appropriate follow focus aperture value corresponding to the subject distance, the improvement comprising selectively actuatable means for varying the follow focus aperture at which the flash fire signal is provided in correspondence with different ones of a select plurality of film speeds.

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