However, if your A570 is like my A590, you'll find that even using aflock the camera still goes through the focusing process each time you take a picture, or at least a lot of it. It ends up with the fixed focus you've set, but on my camera there is still a good bit of mechanical noise. It's as though it goes through the autofocus process, but then discards that and uses the aflock value. The only way I've found to avoid this and just have it click the shutter is to keep it in MF mode, which requires leaving the display activated. I do that, and stick an unconnected plug into the A/V jack, which saves a little power, but not much.
Since my A590 is probably the last Canon P&S I'll be able to buy at a reasonable price which has full manual control, I'd like to do what I can to make it last. So I'm willing to change the batteries more often if that will help. But if there's another way to solve this problem and still turn off the display, I'd like to know about it.
