EXCERPT page containing first few paragraphs. 2017-10-22 17:36:04
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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:
- First example with compressed raw shot with Zeiss Batis 135mm f/2.8.
- 2nd example with uncompressed raw shot with Sony 70-200mm f/2.8 OSS GM.
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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Diglloyd Guide to Mirrorless offers comprehensive integrated coverage of most APS-C and full frame mirrorless cameras and lenses.
Special emphasis is placed on Sony full-frame, including Sony lenses and the high performance Zeiss Batis and Zeiss Loxia lenses plus Rokinon/Samyang and others. Fujifilm X, Olympus and Panasonic M4/3, Sigma dp Merrill and dp/sd Quattro are also covered in depth. Years in the making, it offers a wealth of material for choosing and using a mirrorless camera.
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