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- To: telecine at sun.alegria.com
- Subject: photographing monitors
- From: Dave.Satin at SMAvid.com
- Date: Wed, 21 May 1997 15:13:22 -0500
- Comments: Authenticated sender is <DAVE at dALE.SMAVID.COM>
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- Organization: SMA Video Inc.
- Priority: normal
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Ok Folks, here's how it works:
If you have video running at 25 or 29. 970 fps
AND you can run the camera in sync with the video, then the proper
shutter angle is 180 or 200 degrees. There will be no roll bar.
If you have video running at 23.976 or 24.002 fps (the prevalent
"24fps" video speeds) AND you can run the camera in sync with the
video, then the proper shutter angles are 180 or 200 degrees. There
will be no roll bar.
If you have video running at 29.970 and the camera MUST run at 24
fps, then the proper shutter angle is 144 degrees. What you will see
on the film is 2 very thin roll bars, but they will be locked in a
user-selectable position, assuming that you are using a synchronizer.
If you do not use a synchronizer, the two thin roll bars will slowly
drift up the screen as the film rolls.
By the way, the Cinamatography Electronics film to video synchronizer
has a mode that is mislabled as "computer". This setting will run the
camera motor in sync with the video at 14.985 fps. This setting is
intended to "double" the apparent resolution of the video as
photographed on the film. Why? Well I will tell you. Any film to
video synchronizer allows the exposure of one field of video
(assuming that the display you are shooting is interlaced) onto a
frame of film. Running the system at half speed allows for both
fields of video to be photographed on each frame of film.
Executive Vice President 212.226.7474/V
Director of Engineering 212.941.0439/F
SMA Video Inc.
100 6th Avenue 10th Floor
New York, N.Y. 10013-1689
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