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Pix monitors on a film set



Most NTSC video shot on set these days starts as normal video. It is then scan
converted to a 655 line, 24 fps version of NTSC, and recorded on 3/4" VTR's
whose capstan and video drum servos have been modified to operate at the slower
frame rate. Of course the camera and VTR must be synchronous. The film camera
can drive the VTR's Ext sync input and the video head will "frame lock"  to the
cameras shutter pulse via a "VTR Synchronizer", a simple PLL that allows you to
view the video monitor through the camera viewfinder and "dial out" the V
blanking bar. Vice versa works too. there is a "Camera Sync Box" (another PLL)
that inputs off tape vertical sync from the VTR and drives the film camera.
Again you are provided a knob to move the bar out of the picture. By the way,
the video is color corrected for film lighting during the scan conversion
process. The film camera shutter angle is placed at 180 degrees so that it (the
film) will ultimately record one full field of video. There are several
companies in town providing these services.
John Leisten
JL Cine at aol.com