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"RE: Odd focus with 50mm 1.4 on D800"
The 50 1.4 is not known for flat field --- or maybe I should say infamous.It IS known for great performance in in-focus areas -- for an f1.4 lens. Just don't expect superb ~overall~ IQ at f1.4 --- that's not the reason this lens exists.Flat field? 105mm or 60mm micro. 50mm f1.8 is quite a bit better than the 1.4. Etc., etc. . . .