The problem was his shutter speed. The 1/600th speed is way WAY fast. That’s great for stills of fast motion, but when used for video it eliminates all of the motion blur in the individual frames which our brains use to interpret as smooth motion.
Since he was shooting 30fps, a “normal” shutter speed would be 1/60th. As you get faster and faster than that, the crisper each frame will be and the more stuttery or stroby the motion will look. Obviously, his 1/600th shutter speed is ten times what a “normal” 1/60th shutter would be (or rather, it’s one tenth, whichever way you want to look at it).
The donominator of a “normal” shutter speed is generally half the frame rate. That is, for 24p footage, it would be 1/48th. For 30p footage, it would be 1/60th. For 60i footage it would also be 1/60th (because it’s still 30fps, just 60 fields per second).
There are a few reasons to crank the shutter speed up higher than normal. One would be if you like the “Gladiator” or “Saving Private Ryan” narrow-shutter look as a special effect. The other would be if you intend to slow-mo the film later (although you wouldn’t crank it up nearly as high as your friend did). Otherwise, unless it’s the look you are going for, the results will be stuttery indeed.
T2
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Todd Terry
Creative Director
Fantastic Plastic Entertainment, Inc.
fantasticplastic.com
