was using my S100 to take some NYE pics at a friends house. the lighting was good enough where the camera didnt need to focus-hunt, and yet for some reason i was getting soft focus with it. i tried various modes - auto, P, Av, M.... in all cases, sometimes when i would compose a shot, the camera would get focus lock but the image was significantly blurry. if i tried to refocus the same shot, it would focus lock perfectly fine on the next shot.
i dont have any samples, but a good example would be a couple of people next to the xmas tree. plenty of contrast, and enough light, and yet it would be soft. any ideas?