EXCERPT page containing first few paragraphs. 2019-07-21 00:47:51
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These examples shot in the White Mountains of California late in the day to night.
Ancient Bristlecone Pine just after sunset
At f/9, the Pentax 50/1.4 is performing at is best but with some loss of micro contrast from diffraction, mostly dealt with via sharpening. Here I did not use diffraction mitigating sharpening because I did not want to increase the fine-grained noise (minimized by use of pixel shift, but still there). Instead I used only wide radius contrast enhancement.
Pixel shift mode on the Pentax K-1 Mark II can be a godsend for images like the one below, which required considerable contrast control. While it often has issues from subject motion and is thus inapplicable, when it works, it halves the noise level, which makes for ultra low noise even with aggressive contrast control where deep shadows are opened up. The noise is far superior to the Nikon D850 or Nikon Z7, including a freedom from hot pixels.
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