Camera system with flash control based on focal length

Details Camera system with flash control based on focal length Camera system with flash control based on focal length

2006-10-31

2006-10-31

Mahoney, Christopher (Department: 2851)

Photography

Flash system responsive to focal length or distance

C396S157000

Reexamination Certificate

active

07130535

ABSTRACT:
When the focal length of a photographic lens is less than a first focal length, a dimming correction amount deltaY is set to a certain minus value (deltaYW=−WddY) (S100, S150). When the focal length is greater than a second focal length, the dimming correction amount deltaY is set to a dimming correction amount deltaYT for a longer focus side (S110, S160). For the focal length falling between the first and second focal lengths, the dimming correction amounts deltaY is calculated with the deltaYW and the deltaYT being weighted and mixed according to focal-length information. Accordingly, even when a photographic lens having a short focal length is used, flashing can always be controlled stably with accuracy.

REFERENCES:
patent: 5231447 (1993-07-01), Takagi
patent: 5848304 (1998-12-01), Ikemura
patent: 6327434 (2001-12-01), Okumura et al.
patent: 2003-666504 (2003-03-01), None

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