[russell shaver] ""double shutter"? Really? Got a reference for this "technique"?"
First off it is not a "technique" as in trick.
This is the way the film projectors have worked since Edison, and it has been mimiced in the digital world and a simple search of Cinema Projection or PsF would bring up the info, since you seem to not believe.
http://en.wikipedia.org/wiki/Movie_projector#Shutter
http://en.wikipedia.org/wiki/Progressive_segmented_frame
gary adcock
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