ahhh - i guess i see, dear Pascale... :) well - that's "logical"... you're working with an SLR - that means no light get's to the chip unless you have pressed the button and took the pic... that's why there's just an histogram AFTER you made the shot. your "little" cam has not shutter like the SLR and is exposed while you're aiming and so you can watch the histogram while aiming... but that's impossible with an SLR... and SLR knows the pic only AFTER exposure and can give you the histogram... is that what you wanted to know?