I've had a Canon EOS Digital Rebel XT for years now and have recently been trying to actually learn how to use it outside of "Auto" mode with the kit lens. So, my first step was to purchase an EF 50mm f/1.8 II due to what I'd read about its low-light/fast performance. While I learn what's what I've been sticking to Aperture Priority (Av) mode, 1.8-2.8. I'm having trouble with focus, though. I don't get anywhere near the "tack sharp" results I see from sample low-light/hand-held shots posted on the net (I use auto-focus, center point). No problem in flash mode, but I hate a flash and that was the main reason I got this lens. Here's a shot with a bit of sun: And on a cloudy day: Any pointers,critiques would be greatly welcomed. Should I expect sharp results hand-held with room light in Av mode? Thanks!