EXCERPT page containing first few paragraphs. 2022-07-06 15:45:31
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This aperture series at f/1.4 and f/2 and f/2.8 shows how well the Sigma 85mm f/1.4 DG HSM Art captures night scenes at distance, including stars and very fine details of rock and snow in the mountain peaks.
Peaks by Moonlight
Adobe Camera Raw 9.7.0 (668): view ACR settings. Camera Profile=Adobe Standard. No lens corrections utilized. White balanced set using snow which was assumed to be white.
These were long exposures: 30 seconds for f/1.4, 56 seconds for f/2, 104 seconds for f/2.8.
The Nikon D810 was unable to focus even in magnified Live View, so I focused manually on the star just above the mountain at center. Whether there might have been a better focus point for that area of the frame or for focus across the frame cannot be said, but the only feasible approach is to minimize the size of the dot (the star) since the rest of the scene is far too dark to focus on. Unfortunately, focus seems to be off just a bit, the evidence for that being that must of the frame lacks good sharpness until f/2.8, excepting the extreme top left corner which is amazingly sharp at f1/4/
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