Quote:
Originally Posted by Jose
What I am trying to say is that the 580EX II claims that it adjust automatically to the digital camera sensor in use but this not appear to be correct.
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I understood what you were trying to say, but the flash does not claim that it adjusts to the camera sensor in use. It claims to adjust to the lens focal length, and it does.
As for your first example of underexposure, that is what I would expect. You're shooting a white wall, which the camera will try to make middle grey, as it should, thus underexposing the image. You have to use a positive exposure compensation (+1 or so) when shooting a scene that is mostly white to get it looking correct. And on top of that, you have a window in the image which will reflect the flash. Canon camera's try to protect from blown highlights. This means that if one shot had more flash reflecting from the window than the other, that image will be darker because the camera tries to prevent the reflection from getting blown out.