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How to avoid judder (or stutter)
Having only worked in the U.S. using Sony 900’s and mastering on 10801 60P, I now find myself in the VariCam world series producing a four hour HD project that is shooting and mastering at 25p. I’ve viewed side by side tests shooting with the VariCam at 25 and 60p and am vari concerned about the so called “juddering” effect that is very apparent when either panning across vertical lines or with moving objects like cars passing through a static shot. How do I best direct my DOP’s to avoid this problem? It appears even in fairly slow pans and my show is going to be all off the shoulder, fairly active though not frenetic. I appreciate any and all constructive thoughts and thank you in advance.
As an aside, have worked with you John at ABC Net in L.A. a decade or so ago.
Cheers.
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2 Replies
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Are you talking about on an HD progressive monitor or in the HD viewfinder on the Varicam? At 25FPS and 180? there is no difference in motion blur or length of exposure to shooting on 35mm on the same settings. The apparent sharpness of HD edge to edge can make this appear worse. But mostly what is viewed as shudder is due to seeing a 25FPS image played back progressively at 25FPS on a monitor or the viewfinder. In post when the material eventually becomes interlaced and becomes 50Hz the persistence of vision will create a smoother feel. 25Hz is not a fast enough frequency to fool the eye into seeing smooth motion.
it is somthing that has to be gotten used to as a DP working with these progressive cameras at 24/25FPS, but otherwise panning rates should be similar to those chosen for 35mm shooting. I would suggest shooting a test and taking it through your post process to see the effects of pans and shuddering once transferred to it’s finishing format.
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Use a wide prime lens when panning. Don
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