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Pix monitors on a film set N




To: "telecine group" <telecine at xyzoom.alegria.com>

DN>Here's a difficult one.  If a Video Monitor is part of the set during a film
DN>shoot and that monitor is displaying normal 60 field NTSC video and the film
DN>camera is recording 24 fps there is a very objectionable Shutter Bar recorde
DN>in the filmed image of the Video monitor.

Hi Dave,

Short answer is that the clients must hire a competent video playback
engineer.

This person will take the footage to be played back on the monitor,
convert it to 24 frame video, color correct it based on the lighting
being used on the set, and bring 24 frame playback gear and a film-video
synchronizer to eliminate the shutter bar.

Other options include using 30 frame video gear, setting the camera to a
144 degree shutter, and using a high rez speed controller to "bump" the
shutter bar out while shooting 24 frames/sec.  Note that most DPs will
be remarkably unhappy using a 144 shutter.

Or, shoot the monitor at 29.97 and use a film/video sync box to
eliminate the shutter bar.

In any case, the playback footage most likely has to be pre color
corrected somehow.

Also, note that Panavision gear is the worst for this type of thing,
because of their "butterfly" shutter technology.  Almost without
exception, Panavision cameras will exhibit image flutter where the
shutter bar enters and/or exits the vertical interval because of their
internal construction.

Longer versions of the above available on request.

--Bob

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