I think what he means is bracket the exposure either side of the 'correct' one using the manually set aperture and/or shutter speed i.e. f8 or f11 or shutter speed 125th or 250th. I do not know the 400D but expect it is the same as the 40D: set the mode dial to M, use the 'Quick Control' dial (the one on the back) to set the aperture and the 'Main' (by the shutter button) dial to set the shutter speed.
Last edited by miketoll; 01-10-08 at 20:15.
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