On Oct 31, 06 16:14:13 +0100, Carlos E. R. wrote:
- Images will start to look steady if shown 50 times per second (PAL is 50Hz, NTSC 60Hz, for film each picture is shown three times, so it is actually 72Hz with 24fps)
When I worked in an old projection cabin, film was projected at 48 Hz, 24 fps; ie, each frame was projected and obscured twice, with a mechanical obturator. Things might have improved with the new xenon lighting, I dunno, but I suppose.
Well, I think I remember that I read that long ago as well, but later on
I read that the typical shutter discs rotate three times as fast as the
film moves nowadays. I guess they couldn't make the film transport
mechanism fast enough back then. Today they are using low air pressure
devices to suck the individual frames into place... :-P
So I guess it's save to assume this improved a bit :)
48Hz is barely enough to have a steady image...
CU
Matthias
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Matthias Hopf