Comment: Re:In film, frame rate = exposure time (Score 4, Informative) 607
This wasn't shot on film. The exposure time in digital has nothing to do with the frame rate.
I didn't realize it was shot digitally, but you're statement isn't completely true. If you shoot something at 48FPS then the slowest possible frame rate you can have is 1/48th of a second in digital. Digital does give you the chance have a faster shutter speed though.
Here's the kicker though, in film you have to double it. So 24fps would give you 1/48th shutter speed (half open half closed) meaning the motion blur for 48fps digital vs 24fps film should be the same, which explains why they picked 48fps - it afforded them the option to do either 48fps, slow motion or 24fps in post without giving anything up (except disk space).