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I just read the manual and see that it says to half-press, wait, then full-press... but I don't understand why. Believe me, I know that the half press triggers the auto-focus and exposure algorithms and then locks in the values. I use this regularly to prefocus in preparation for a moving target, or focus then wait for the perfect moment, or focus then reframe the shot, or all the same for exposure... but if I want the shot ASAP then I full press and my camera (a Panasonic FZ15 at the moment) focuses then shoots. Does the SX40 not bother to focus if you don't pause at the half press? Or is it just a matter of users often forget to hold still until the shot or not taking care to make sure that the correct subject was identified for focus?Read the manual and learn to allow the camera to focus completely before pressing the button all the way.