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Old November 17th, 2002, 01:08 AM   #1
gateway1
 
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question about shooting 24 fps

i have heard some people shooting 23 or 20 or something less than 24fps on commercial shoots.

I suppose someone can shoot at great than 24fps as well

So my question is, if you shoot less than 24 frames per second does that mean your shooting film slower so it is in slow motion?

I realize this isnt a "film" message board, but you guys seem pretty smart and i figured you guys/gals would know.

thanks
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Old November 17th, 2002, 01:18 AM   #2
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It depends on the speed that the film is projected at. If it were shot at 20fps and projected at 20fps it would appear normal. Fast motion may appear jerky. This is caused by fewer frames per second to record the movement. If 20fps were run at 40 fps it would appear to be twice as fast. If slowed to 10fps it would appear as slow motion. So, if the commercial was shot at 20 fps and played at 24fps it would show 20% faster .

Jeff
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Old November 17th, 2002, 09:37 AM   #3
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If you shoot at less frames per second, (cranking the camera) the footage when projected at normal 24fps speed, would appear to be in 'fast motion' or speed up.

Most comming thing u see is not the fast motion, which is easy to do in post, but for true slow motion that looks seemless, you shoot at a high framerate, like 48fps or even i have seen 96fps, that is for super slow mo.


kermie
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Old November 17th, 2002, 10:49 AM   #4
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I don't think electronically shoot or processed footage still needs fast cams for moderate (4x) slowmotion. Field insertion based on motion prediction and warping can do a perfect job for such problems.
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Old November 18th, 2002, 10:33 AM   #5
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I believe its called Under-cranking.

Most martial arts films in Asia and elsewhere shoot fight scenes at 22 or 23 fps. That little bit makes a big diference on the percieved speed on screen when ran at normal 24 fps.
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