Sound delay

[tim]

As we know, light travels a lot faster than sound, so we see a lightning flash before we hear the thunder.

I notice in film and TV that, with the increasing use of radio mikes, lip sync is maintained as the camera zooms out from the actors. Since, with modern zoom lenses, actors could be a hundred metres away, there should be a delay in the lip sync as the camera zooms out. It is the same with, say, explosions at a distance.

Which is the more realistic for film? Sync despite distance, or a realistic delay?

[jessh]

if an actor is far enough to where there would be a noticable delay in audio you most likely aren't going to be able to see their lips well enough to notice sync, the bigger issue is usually volume, as your characters walk away form the camera should the volume be realistically lowering and trailing off or not, with wireless lavs you arent going to get the audio naturally decreasing and are goign to need to do it in the mix if that is the effect you want.

~Jess