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Disadvantages with filming 50fps?

25fps 50fps frames

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#1 Matt Silvan

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Posted 11 January 2013 - 07:01 AM

I'm planning to permanently switch my frame rate to 50fps (or 60fps in NTSC).

The shutter speed would be 50, 100, or higher accordingly. This is because I would like to have the option to apply slow motion during post production. With the increased number of frames and data available, I hope to smoothen the motion better than a software could, and continue to use a 25fps timeline. Am I missing any drawbacks or disadvantage when using this setting? Is there anything I should mind during filming or post production?

Many thanks for your input!

Edited by Matt Silvan, 11 January 2013 - 07:02 AM.

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#2 Phil Rhodes

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Posted 11 January 2013 - 09:57 AM

The only serious problems are increased storage requirements (or poorer image quality due to increased compression) and the stroboscopic motion rendering of a shorter effective shutter speed. The latter can in some cases be repaired with optical flow interpolation, but that's not a practical workflow for all circumstances and you should be certain that you and your clients are OK with the mild short shutter speed look you'll get for shooting 50 for 25.

There may be odd flicker issues with certain types of lighting, more than you'd get at 25, but I don't imagine you'd have too many troubles if you shot 50fps in a 50Hz-mains locality.

Beyond that as long as you can make your NLE handle it, fine.
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#3 Matt Silvan

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Posted 12 January 2013 - 12:21 PM

Thanks for your advice, Phil. I definitely have to try it out and test both extensively. My camera would only shoot 50fps at the cost of a lower resolution. Files sizes are approximately similar, though. The picture is darker due to the higher minimum shutter speed, but I'll be careful of any flicker issues as you said.

Edited by Matt Silvan, 12 January 2013 - 12:22 PM.

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