5D3 Pattern Noise Improvement and High ISO Cooking

Started Apr 1, 2012 | Discussions thread
John Sheehy Forum Pro • Posts: 21,743
Re: 5D3 Pattern Noise Improvement and High ISO Cooking
1

bclaff wrote:

The 5D3 also look suspicious to my practiced eye in that the FFTs change from a horizontal line to a vertical line from ISO 50 to ISO 102400. I can barely make out a diamond shape in the ISO 6400 image. Such a transition could only come from signal processing. (Obviously subtle compared to ISO 102400!)

Nothing strange about that at all. Some forms of banding are proportional to amplification in strength, and some are post-gain, and therefore fixed across ISOs The vertical banding in the 5D3 is mainly post-gain, and becomes insignificant at high ISOs as the gain-related noise grows relatively stronger.

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John

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