a film camera, you have to shoot a specific speed to make miniatures
look real. How did you do this with a digital camera that only
shoots 24 frames per second?
This report comes from the Official
Star Wars Site!
Answered by: John Knoll
Most of the models in
Episode II were shot digitally on a motion control system. In a film
camera, the shutter is only open half of the time. The other half,
while the shutter is closed, the film is being moved to the next
frame. Since the digital camera doesn't need to do this, it's
possible to have the shutter open essentially all of the time. We
wrote some software that then lets us average some arbitrary number
of frames to synthetically create longer exposures. For example, to
simulate one-second exposures, we average 24 frames. This technique
was used throughout the film.
The other case we
frequently have to deal with is when we run the camera faster than
24 frames per second, like when shooting explosions. There was very
little call for that on Episode II, since the explosions were done
using CG techniques. If we really need to shoot a high-speed
explosion, we have to do it on film. Perhaps someday we'll have
digital cameras that can run at 300 frames per second, but we don't
have them yet.