Originally posted by quintinir As far as the hint on the flash.. this is a great info! I didn't know this thing and it explains a lot of other situations.... So if I want to set time and aperture without using auto ISO what should I use? Full manual? Or better question... how can I have auto ISO understand that there will be a lot more light when I shot? there must be a way to use the flash to make light (not just autofill) and therefore predict how much ISO is needed (not based on the ambient light I have before shoting but on the light I will have durig the shot).
Fully manual is one way of getting full control of the exposure, but if you are in TAv mode you can use exposure compensation to get the camera to select lower ISO, You set the exposure for how much ambient light the camera should capture, then the flash fills in with the rest of the light for correct exposure. But as the built in flash is not very powerful there are limits on what it can do.
Any advanced flash photography really require more powerful external flash.