I came across it when i had my SD600 and my W850 both recording at the same setting of 50p.I usually match two cameras up by a click of sound and noticed the video was about 3 frames off.http://www.shiresvideography.com/weddingvideographerlondonsound.htmlVideoOn the SD600 the sound comes 1 frame late and on the other camera the sound comes 1 frame early.Having done the test on it now, it doesn't seem as bad as when i was thinking 3 frames, it's sort of 1.5 frames each side. But when matching them up i guess i'll just have to do it via video and lower the volume on one track.