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Shutter Confusion


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#1 anthony derose

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Posted 02 April 2008 - 09:56 PM

Confused with shutter. Ok 180 is what most cameras run off of or 1/48th of a second for 24p. Where I'm confused is films like Saving Private Ryan use a fast speed to get rid of motion blur almost like sports action photos. I know the lower you go below 180 the faster the shutter but most camera don't go above 180 so is there a way to slow down your shutter? I'm thinking of like Chris Doyle's fallen angels when the action is very blurred and strobic. How do you achieve that style?

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#2 Michael Nash

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Posted 02 April 2008 - 10:52 PM

It's the result of a two-part process. First, the action is filmed at a slower frame rate, like 6 or 8 fps (with a 180 shutter) to get more motion blur per frame. Then, the film is step printed (frames repeated in printing) back to 24fps to restore normal speed motion. You get more blur, but motion also appears more strobed as each "real" frame is held on screen for a longer duration.

If you're finishing digitally you could achieve the step-printing part by transferring the film at the same frame rate it was shot. Or, if you transfer the original frame rate as a true 24P sequence (with no 3:2 pulldown) you could simply slow-mo the footage by the appropriate percentage.

Some video cameras have a "slow shutter" feature that effectively does the same thing, exposing one frame for the duration of 8 frames or so, and record it real-time.

And please, don't refer to film as "24P." That's video. Film is (x)fps. ;)
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