Summary: Great camera except in Programmed Auto and Auto ISO. As soon as a speedlite is connected, the D4 up's the aperture to F7.1 So not much point in having the 24-120 F4 Nikon lens then. More disturbingly, with a Speedlite, the D4 up's the ISO and the Aperture! Bizarre. So you end up with unnecessary noise. Have spoken to Nikon who are reporting this to Japan. The camera seems fine in Aperture Priority Auto provided you turn the Auto ISO to Off.