P3D Re: Flash and 3D

[roberts@xxxxxxxxxxxxxxxxx (John W Roberts)]

>Date: Mon, 18 May 1998 23:23:39 -0600
>From: fotoschack@xxxxxxxxx (Gary Schacker)
>Subject: P3D Flash and 3D

>The problem with on-camera flash is that light falls off very quickly as
>distance increases.  (the inverse square law I think)

Therefore, purely on a mathematical basis and without having actually tried
these, it would appear that:
 - Using an extended flash (e.g. an umbrella reflector), the light should
     fall off less rapidly than with a small flash source. [Inverse
     square is the model for a point source.]
 - If the flash is powerful enough, moving it back further away from
     the subjects should help reduce uneven illumination (provided
     the shadow of the camera, etc. doesn't fall on the subject!).

John R


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