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Does “the same” lens, with different autofocus systems, have the same optical quality?
I'll give examples with Nikon only, but the question is pretty general.
So, is this a fact or not?
Examples:
Nikkor 50/1.8G AF-S, Nikkor 50/1.8 AF-D and Nikkor 50/1.8 AF
70-300 AF and 70-300 AF-S
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