Under identical lighting the following happens. Camera D2x Lens 17-55mm f/2.8 Set camera to "A" priority: Locked down on a tripod I set the f stop to f/2.8 and the camera sets the speed at 1/500 of a sec and it is a perfect combo and the pictures comes out perfect I didn't move the camera and maybe 1 minute between takes. Now I set the f stop to 5.6 and the camera sets the speed to 1/250. and for discussion lets say theses settings are also a perfect combo, but it is actually .7 EV off. The shot is too dark. If I bracket by .7 EV the picture comes out perfect on the + .7EV bracket. Can I assume anything? At first I thought it has to be a camera malfunction. Those the camera says f/5.6 and 1/250 of a sec, it isn't happening. (?) But the same steps taken with my 50mm f/1.8 hits both shots right on. Am I crazy and don't know anything about light and lens (which I'll admit) or do I need to find help at Nikon.