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Re: Shutter Speed

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David Mullen
Re: Shutter Speed
on Sep 23, 2002 at 4:55:37 am

If you shoot at 24P, then with no electronic shutter employed, your per frame exposure is 1/24th of a second. However, to simulate the effect of a 180 degree shutter angle in a film camera, which is closed 50% of the time, most people set their 24P cameras to a 1/48th of a second shutter speed, losing one stop of light.

Shooting at 24 fps with a film camera and exposing at 1/24th of a second isn't possible, so doing so with a 24P video camera risks getting motion blur not possible with a film camera running at 24 fps. However, if you're stuck for getting enough exposure, it's a good trick to turn off the electronic shutter and gain another stop of exposure by going from 1/48th of a second to 1/24th of a second at 24P.

You can't really expose even longer than 1/24th of a second without actually dropping the frame rate below 24P.

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