The reader is strongly advised to read the lens evaluation notes.
The Nikon AF-D 200mm f/4 ED Micro-Nikkor is Nikon’s longest macro lens, focusing to 1:1 reproduction ratio.
As with any macro lens, one cannot assume that peak performance will be reached at infinity; as a macro lens one might properly expect that performance has been optimized for close-range focusing.
Overall optimal aperture appears to be ƒ/6.7, with ƒ/5.6 showing weak corners yielding a nice pop to ƒ/6.7. While ƒ/8 shows a slight loss of micro contrast, it is also a very good choice for a little more depth of field. Stopping down beyond ƒ/8 even 1/2 stop to ƒ/9.5 quickly degrades image contrast.
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