Depth number based technique for selecting lens aperture size an

Details Depth number based technique for selecting lens aperture size an Depth number based technique for selecting lens aperture size an

1990-09-20

1992-06-23

Perkey, W. B.

354423, 3541491, G03B 716, G03B 1503

Patent

active

051247402

ABSTRACT:
Apparatus, and various accompanying methods, for use in a photographic camera for selecting a lens aperture setting and/or flash output configuration for a full flash exposure. Specifically, the lens aperture setting and/or flash output configuration are selected based upon a difference existing between a first parameter, i.e. a guide number, that indicates the amount of output power that the flash is capable of producing and a second parameter, i.e. a depth number, that indicates the amount of flash illumination required to photograph a scene with a pre-defined depth-of-illumination about a subject situated therein. The flash output configuration can be a spread flash with a selected one of a number of different spread angles, a bounce flash or, if the flash unit is an energy saving type, a reduction in (throttling back) the flash output power.

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