Hi,
I am starting to practice flash photography with my 40D and a 580EXII and Better Beamer. This morning I set the flash exposure compensation on the 40D to -2 (the FEC range on the 40D is only +/-2) and still had significant "overflash" (with ETTL mode and HiSync). How can you further reduce flash output?
An indirect way I found was to reduce the ISO. This effectively shortens the range of the flash. Thoughts?
Thanks in advance. JR

