Having tried Cinema Mode, I find in very bright situations I sometimes get banding in clear blue sky, much like when I tried Cinestyle on my EOS 60D. In the case of the 60D I just accepted that I was pushing the codec a bit too far with the add-on profile and stopped using it, but this is a built-in effect and it is essentially the same camera as the professional XA 10!
I used Cinema Mode Standard with Contrast at -2, Colour Depth -1, Key M, Softening Filter off and manual exposure set to just remove 100% zebras in the brightest highlights. I use a Hoya ND8 over the lens, but it does not cause the problem in Manual Mode, so I have to assume it is not the problem (!). The banding is definitely baked into the camera output. As much as I'd like to, I cannot get back to the location to test adjustments for a year or two, so I ask if anyone else has had this and can either tell me whether this is a common problem, or suggest what CM settings I may need to change.
I've never had this happen in Manual Mode and this is how I am now shooting. If you can help, thanks.
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shooting outdoors you might be better off using cinama mode AV rather than full manual and locking the white balance. too much chance of a major change in light that you can't control.
p.s. did you use the proper color correction LUT during post when using cinestyle? it's all i shoot with using my 80d, 70d, and 60d. never had anything but the results i was looking for outdoors or inside.--
"a lot of people are better dead" - prisoner KSC2-303
Interesting, although I don't see how using auto exposure will make any positive difference. I use the custom dial as iris control and tweak it for each shot, unless things are changing so quickly I don't get the time. I forgot to mention that when travelling I tend to use WB presets, so it would have been set to the sunny position.
Cinestyle: I was using Sony Vegas and it would not accept LUTs at the time, some kind person gave the coordinates so we could make our own.