The reader is strongly advised to read the lens evaluation notes.
The Nikon AF-D 105mm f/2 DC is a specialty lens with a defocus control for over-correcting or under-correcting spherical aberration. For this test, the control was set to zero (neutral).
The Nikon AF-D 105mm f/2 DC performs uniformly well over the frame, reaching peak performance by ƒ/2.8 in central areas, but it requires ƒ/5.6 - ƒ/8 for best performance in the far corners.
Overall, ƒ/4 - ƒ/8 provides about the best overall performance, depending on whether one favors maximum central or corner performance.
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