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Summary of Nikon 50mm Lenses
The Nikon “normal” lenses (50 - 58mm) all have strong hot spot issues. The Olympus 50mm f/1.2 (converted to Nikon mount) is particularly troublesome, though the intense central dot seen in the Nikon lenses is just as bad, in a slightly different way.
However, lenses like the NOCT-Nikkor can be used with very pleasing effect at wide apertures (f/1.2, f1.4, f/2, f/2.8). Not every image is made better by stopping down and some certainly are most pleasing at f/1.2, so no lens should be totally ruled out because of hot spots.
Shown below are the four Nikon “normal” lenses tested.
Nikon normal lenses Hot spots
Hot spots behavior...
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