--- "F. Craig Callahan" <[EMAIL PROTECTED]> wrote:
> But is there really a focal length multiplier in effect? Isn't it
> just that the
> digital sensor uses a smaller portion of the image circle presented
> by a lens, 

Yes, it does use only a part of the lens' image circle. Therefore, you
should be able to set the flash at 'focal length of lens' * multiplier
without cutting the flash off. If you saw the whole 24x36mm you would
see the cut-off but since the sensor is smaller you want see it. My
guess.

Robert

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