Try setting your shutter to 1/50 to emulate the 180 (actual 178) degree shutter of a film camera since you are shooting at 24fps.
Also, only shoot with ISO in multiples of 160: 160, 320, 640, 1250 (as there is no 1280). I get no noise at 640 on a 5D mark III. I know this is a different camera but it should be close to the same as far as noise. at 800 with no or very little light you will get noise in the shadows.
Warren Eig
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email: warren@babyboompictures.com
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