EXCERPT page containing first few paragraphs. 2023-03-25 05:02:06
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Field curvature and Aberrations (Night-time)
The image was taken at f/1.4, and studying it gets curiouser and curiouser (apologies to anyone named Alice).
Through serendipity, the focus for this example happens to demonstrate the varying zone of sharpness of the 24/1.4L II (field curvature). Sharpness varies very noticeably at similar distances, from obviously blurred to fully sharp, depending on the offset from center—field curvature.
Metreon area at night, San Francisco
Adobe Camera Raw 8.8.0 (397). ACR settings. Camera Profile = Camera Portrait.
The camera was tilted slightly down, which aligns the plane of focus to more distant areas at top, and closer areas at bottom.
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Diglloyd DAP is DSLR-oriented, but also contains workflow and other topics. Much of the focus is on Canon and Nikon but also Pentax and Pentax medium format.
Special emphasis is placed on lens evaluation, focusing on Canon and Nikon and Sigma lenses, but with a few others like Rokinon/Samyang.
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