A company that I founded, at one time shipped about half the world's supply of 
PC graphics cards.  We got several requests from the film and TV industry for 
display devices that produced images that could be filmed.   Our cheap-ass 
solution was a card that output 24 Hz video and the camera was synced to the 
board.  

Things got interesting when the scene involved dozens of monitors. The cheap 
solution was a video board where the frame timing chain was triggered by the 
camera shutter.   A much better (and much more expensive) solution was a true 
"genlock".   We won a couple of SMPTE awards for our work and willingness to 
work with the film industry to supply custom solutions for some rather tricky, 
one-off requirements.

----------------------------

>There's a whole industry of producing 24 fps TV and computer monitors so the 
>display "looks" ok when filmed at some rate.  I used to have a bunch of 
>"genlockable" VGA display cards that could be put into a PC and synced to some 
>supplied sync signal.                                        
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