When I got my 20D, one of the first things I did was turn off the focus confirmation beep. Then, I found I was getting a troubling number of out of focus shots. I worried about all of the focus issues I've read about here. But last night I decided to turn the beep back on and I realized how often the camera failed to lock focus for a legitimate reason (low light, low contrast, repetitive pattern, etc.). With the beep turned on the camera correctly told me so by not beeping. I realized that I may not have been noticing when the focus confirmation light might have been blinking to notify me of inability to focus... I'm going to leave the beep on for a while (even though I usually hate those kinds of beeps). Just wonder, who leaves the beep on?