EXCERPT page containing first few paragraphs. 2017-09-22 19:06:48
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These are measured results of the Otus 85mm f/1.4 APO-Planar. Contrast (MTF) varies with focusing distance with most lenses, and the 85/1.4 Planar is no exception; both infinity and close focus are shown.
Note that measured results at 10/20/40 line pairs/mm should NOT be compared to fantasy diffraction-ignoring computed results at 30 line pairs/mm (as is common practice in much of the industry).
See Field Curvature Analysis (Nikon D810, Mosaic) for a real world example of field curvature at work—how it plays out.
MTF at infinity focus
Micro contrast at frame center when wide open at ƒ/1.4 measures as high as many lenses ever reach. A gentle rolloff is seen to frame edges, which is due to mild field curvature: actual performance is assuredly better than the chart indicates, but slightly out-of-plane. This is a very low level of field curvature for an ƒ/1.4 lens.
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