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EXCERPT page containing first few paragraphs. 2022-09-29 17:53:41

Sony A9

Two Examples of Pattern/Banding Noise at ISO 100 (Pine Creek Skyline, Mt Tom)

This series follows up on the Poppy example, which showed red channel pattern noise. TWO examples are shown, show that the problem is not related to raw-file compression or to the lens used:

I shoot outdoors a lot, and that often means a dark blue sky, particularly in the mountains and when taking care to not blow out the highlights (snow, bright granite, etc). Dark blue is weak in red channel exposure, so that a pattern noise problem in the red channel should stand out. And so I had planned to approach it on just that real-world basis, which I have now done—and 2 minutes of shooting proved it out. Of course, a bright sky or one overlaid with clouds will give the red channel much more exposure, which will minimize noise and make the pattern noise of the A9 be very subtle to nearly invisible, a corollary that I have also verified.

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Variants sRGB,AdobeRGB,ProPhotoRGB available in full article
f4 @ 1/500 sec, ISO 100; 2017-06-04 11:48:52
Sony A9 + Zeiss Batis 135mm f/2.8

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