In article <4k4ugv$hlu@dfw-ixnews4.ix.netcom.com>, rzuch@ix.netcom.co says...

>This sounds worth trying. [setting 2 flashes to two different
angles of coverage to vary the power in TTL between them]
> I've got both flashes set to 20mm, figuring
>that might give more uniform lighting. Most of my shots are taken with
>the subject about 6 inches from the end of the lens and the flashes
>might be 6 to 8 inches from this subject. Any chance I might vaporize
>my subject with the flash zoomed out to 85mm? Is there the possibility
>that I may be damaging the retinas of these animals by having these
>flashes so close to their eyes? I don't think I would like having one
>of those things put up to my eyes and fired off.

The total power will not be different from your former setup (TTL,
remember...;-), just different in side-to-side balance, with the
"hotter" side not fully twice as much as previously. The total at
a given distance depends on the aperture, so if you wish to reduce
the total the animal sees, open the aperture.
Hope This Helps