Quote (Antichrist- @ Mar 22 2011 03:49pm)
yes you can control it, that wheel you got on it is to control the exposure compensation in ETTL mode, it works the same way as changing the exposure compensation on cameras AV mode, except that it only controls the flash naturally.
what i have been trying to tell you from the beginning of this discussion is that you do want to control the environmental light and the flash light separately if you care about the results at all..
if you want some point and shoot type of flash exposures(like you get with slow sync off and low iso and fast shutter on AV), just put the camera on manual mode, low iso, 1/250th shutter speed and aperture based on dof you are looking for and let the ETTL handle the flash exposure.
Controlling the exposure compensation in ettl mode doesn't grant me higher shutter speeds