P3D RE: Stereo Flash Photography

[Tom Deering <tmd@xxxxxxxxxxx>]

On 9/9/98, David W. Kesner wrote:

>Flash output is usually referred to as the guide number. This guide
>number is dependent on film speed, but to make things easy most
>published charts are based on 100 speed film. A low power flash is in
>the 40-60 guide number range, a medium 60-90, and a high 90-130. In
>order to get in the 130-150 range you will need to buy one of those
>big "potato-mashers" or go to flash bulbs.

Excellent posting, David.  Perfect timing for me, since I've been boning up
on flash theory lately.  After 20 years of faking it, I'm finally buckling
down to learn some flash basics.  It's not so bad, I wish I had done it
earlier.

I'm particularly grateful for the instructions on how to assign a guide
number to an unknown flash.  I'm building a mini soft box around a Vivitar
flash, and it puts out less light.

Enjoyed your post!  More informative photography-related posts!

Tom



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