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Topic: Kinotone & 25 Fps
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Stephen Furley
Film God
![](http://www.film-tech.com/ubbmembers/1277b.jpg)
Posts: 3059
From: Coulsdon, Croydon, England
Registered: May 2002
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posted 12-29-2002 04:28 AM
You just need to divide the normal running time by 25, and multiply by 24. I make that 57 minutes and 36 seconds for each hour of film, a saving of 2 minutes and 24 seconds. I can think of a number of valid reasons for running film at 25 fps, but trying to save time is not one of them, and the time saved would be minimal.
The valid reasons I can think of all involve PAL or SECAM video:
The film was shot at 25 fps with the intention of transfer to PAL or SECAM, or was transferred from one of these, and this is therefore the correct speed.
To make a telecine transfer to one of these systems.
To make a side by side comparison of a film print and a video transfer made from it, or a video original and a film transfer made from it, for quality control purposes.
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Stephen Furley
Film God
![](http://www.film-tech.com/ubbmembers/1277b.jpg)
Posts: 3059
From: Coulsdon, Croydon, England
Registered: May 2002
|
posted 12-29-2002 04:44 AM
quote: Otherwise, I don't see any reason to project a film at a speed other than 24fps!
The film happens to be:
Original Todd-AO format, 30fps
Kinemacolor or Bicolor, 32fps
Showscan, 60fps
Silent film, could be just about anything from 14 to 24fps
Edison Kinetoscope film, I can't remember the speed, but it was much faster than normal.
One of the very few 48fps Imax films.
Shot at 29.97 or 30fps for NTSC video production without needing the 3:2 pulldown
Can anyone think of any others?
I have seen all of these projected except the Showscan and IMAX. They may not be very common, but they are shown.
At least getting a film projector to run at a non-standard speed is generally fairly easy.
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