Before you take the photo, on the LD screen you can see the brightness of the photo change as you change the shutter speed and aperture. I have noticed my sisters canon camera has this but her nikon camera doesn't.is it something to do with the lens? can i turn it on in the settings in nikon? and whats it called? the cameras are canon 550d and nikon d7000
См. статью: In canon cameras, what is the thing that previews your image before you take the photo?