Patent
1980-11-14
1982-05-04
Gellner, Michael L.
354 46, 354 60F, G03B 7085
Patent
active
043279783
ABSTRACT:
A camera diaphragm control device which arrests a diaphragm when a TTL light measurement output represents a given relationship with respect to a reference signal during stop down operation of the diaphragm can automatically set the diaphragm to a specific aperture for flash photography by the aid of a preliminary flash light produced prior to the production of a primary flash light with its intensity maintained substantially constant for a duration covering the period of time from the automatic setting of the diaphragm to the setting of the specific aperture. At the initial stage of the production of the preliminary flash light prior to the stop down of the diaphragm, an operational circuit means correlates or associates the TTL light measurement output with a signal representative of a set film sensitivity and a signal representative of the diaphragm step-difference between the maximum and specific apertures to thereby generate an output representative of a proper exposure time for the specific aperture as the reference signal. Furthermore, circuits are provided for automatically setting the diaphragm to a larger or smaller aperture when the object of interest is located outside the permissible distance range for flash photography with the specific aperture and with the primary flash light.
REFERENCES:
patent: 4213682 (1980-07-01), Yamada
Ishida Tokuji
Kobori Toshio
Gellner Michael L.
Minolta Camera Kabushiki Kaisha
LandOfFree
Camera diaphragm control device for flash photography does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Camera diaphragm control device for flash photography, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Camera diaphragm control device for flash photography will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-879906