your 10d probly AF refocused when you snapped the pic after you recomposed your shot (after focusing by depressing the shutter half way.) on your 10D you can change the AF from the shutter button to the middle button on the upper-right back of the camera. in this way, you use your thumb to AF and your index finger to trip the shutter. i think it's CFn4 in the Functions part of your menu (but check your manual to make sure that's the one.) that's what i've done and my 10D soft-focus problems have nearly gone completely away.
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