Another quickie: You've hopefully read the sticky atop this section about using manual lenses on your dSLR. As long as you have the aperture ring (the one with A-22-16-11-8-etc) set to A, you can shoot in Av mode and let the camera control the aperture, or you can control the aperture from the camera. If you want to use that lens, or any non-A-type manual lens, where you set the aperture on the lens, you need to go to the last Custom Menu setting on your camera and change it to PERMITTED. Now the camera won't black out. Unless the batteries die, of course.