Quote:
Originally Posted by
Adam Lenhardt 
The reason for 48 fps over 24 fps is that its easier to downgrade for non-equipped theaters; you just drop every other frame, and you've got your 35mm print. Even a 24fps version of a 48fps production won't look the same as a 24fps production, because the exposure time on each frame will still be half that of traditional 24 fps. Less blurring, and probably a more artificial feel.
Do they really (still) actually expose at something all that close to 1/24 sec for each frame in practice (outside of very low lit situations)?
I wouldn't think that matters all that much in most cases since I'd expect frames to normally be exposed at faster than say 1/50 sec anyway, if not much faster. If you're exposing at <1/50 sec, just about all motion will be blurred.
Still, I'd think the camera probably needs to expose at something like >=2x as fast as the frame rate to get it done due to all the other factors involved. But even 1/100 sec exposure time isn't exactly fast nor would it yield blur-free captures of most things in motion.
OTOH, maybe since it's digital, the faster requirement would be reduced since other factors like the film advance mechanism won't come into play, so maybe the exposure time can come closer to the frame rate, if need be...
OK, so according to this, films are typically shot at 1/48 sec exposure time at 24 fps (although they sometimes go to 1/50 or 1/60 sec for certain artificial lighting):
http://en.wikipedia.org/wiki/Shutter_speed#Cinematographic_shutter_formula
Anyway, if the digital cameras they use can come close to that at 48 fps, then there should probably be little-to-no noticeable impact in this respect...
_Man_
Edited by ManW_TheUncool - 4/13/11 at 2:56pm