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How to get clean ISO 6400 and 12,800 low light video on the GH2 and 5D Mark II @ EosHD

"One thing I did find with the 5D Mark II is that if you are modifying a colour image to black and white in post, don’t just reduce saturation on all channels. You need to handle the red channel separately and actually I had to resort to Photoshop for the above frame and change the influence

both reds and yellows were having on the image, because that seems to be where the vast majority of noise is in the 5D’s image. It looked awful just applying a standard de-saturate filter to it."