New GF-1, in testing/trial phase. Just shot off a B&W image (in my gallery). AFC. Depressed shutter 1/2 way to lock focus on a specific section of the image. Recompose the image. Noticed the LCD image was "wavering" very slightly. Bit like looking at your reflection on the surface of calm, but not still water. Switched to AFS. No "wavering". Wondering AFC with prefocus using the shutter was the problem or do I have a hardware issue? Firmware has been updated to 1.2. Was this incident due to a user error/ignorance? Image specs: 35mm f8 @1/8sec close up, +dyn B&W, A mode, center-wt metering, default AF zone.