Originally posted by Marc Sabatella It certainly could be a defect. It' also possible it's user error of sort, but only if you were trying to focus on somethng that the camera just wasn't going to be likely to succeed in focusing on. That would be the case if the subject were somrthing like a plain wall with nothign to focus on, or if the light was very low, or if the subejct were closer than the minimum focus distance for the lens. If none of those weere the case, then it's probably the camera.
Thanks, that helps: this was happening while I was shooting the same subject, from nearly the same exact position. I'd take 3 or 4 photos successfully, pausing to review them on the LCD after each exposure, then on the 4th or 5th one the AF would just stop working, even though I just took a nearly-identical photo a few seconds before.
Originally posted by Blue Have you tried it with a different lens and without the flash just to isolate the problem and rule out a faulty lens?
I only have the one lens, so I can't test that, but I'll try it without the flash and see what happens. The lens is brand new and I've taken good pictures with it on the camera, so I don't think it's at fault.