Optics: motion pictures – Removable film strip magazine type
Patent
1977-01-27
1978-10-03
Adams, Russell E.
Optics: motion pictures
Removable film strip magazine type
354 23R, 354 59, 352141, G03B 708
Patent
active
041187148
ABSTRACT:
A light metering system for a photographic camera which may be selectively operated in a through-the-lens (TTL) light metering mode or an outside-the-lens (OTL) light metering mode to improve the exposure control accuracy over an extended range of light levels particularly towards the low light level side. In one embodiment, the light metering system employs a single light value sensing element in combination with light path changeover means arranged upon movement to change over the light metering aspect between the TTL and OTL light metering modes. In another embodiment, there is provided two light value sensing elements of different light response characteristics from each other for adaptation to the respective light metering modes in combination with a circuit transfer switch operable to select either the TTL light metering mode or the OTL light metering mode. With a camera equipped with a shutter preselection automatic exposure control range and a diaphragm preselection automatic exposure control range, it is possible to realize suitable combinations of the exposure control modes with the light metering modes.
REFERENCES:
patent: RE26632 (1969-07-01), Norwood
patent: 3232192 (1966-02-01), Stimson
patent: 3636839 (1972-01-01), Yamamoto
patent: 3683766 (1972-08-01), Nobusawa
patent: 3731604 (1973-05-01), Fujii et al.
patent: 3775001 (1973-11-01), Miyakawa
Iwama Hideto
Okajima Hidekazu
Adams Russell E.
Canon Kabushiki Kaisha
LandOfFree
Light metering system for a photographic camera does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Light metering system for a photographic camera, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Light metering system for a photographic camera will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1804726