"Mark B." wrote in message
...
"Charles Schuler" wrote in message
...
Your equipment is a generation newer than mine but I'll offer that
program mode and Av mode will both provide what you want.


Program mode will assume the flash is the only source of light for the
subject and adjust aperture, shutter speed, and flash output accordingly.
Av will assume flash will light the subject, but adjust shutter speed for
background ambient light. So I'd say they could be very different
depending on ambient light conditions.

Mark

Actually, ETTL does that in program mode, too...

--
Skip Middleton
http://www.shadowcatcherimagery.com