Has anyone else had this problem? I haven't used my 20D for a few days, and I tried to take a pic this evening of my new puppy to use for a Christmas card. Set the camera on Manual, set shutter speed, and aperature just stays at 4.0. I put on a different lens - the 85 1.8, and aperature reads 00. (I started with the 17-40 2.8) I put on the nifty 50 it reads 4.0 again. And of course the camera is just out of the warranty period.