EXCERPT page containing first few paragraphs. 2024-02-21 09:58:47
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These images shot handheld with IBIS using small-spot AF in order to evaluate general lens performance.
Sunrise over Frosty Backyard @ 20mm
The zone of sharpness shows strong near-far depth but covers only about the central 2/3 of the frame. Scanning across the frame at any distance, it can be seen that sharpness rapidly falls off towards the edges. There is nowhere at left or right at any distance where sharpness can come close to competing with central sharpness.
Further, real depth of field is much greater in the central 1/2 of the frame than in the outer zones, which “thin out” in sharpness. This is readily seen by examining the immediate foreground all the way to the large oak tree.
If there is a rearward field curvature involved, it is not obvious to me here; I would expect those redwood trees at far right to be tack sharp.
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