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Dave - Consider this a first... I've got 2 nifty fifties, One is the original metal mount mk1, the other is the all plastic mk2 that is currently available. The mk2 shows field curvature, that is uneven across the field, its a little soft unless stopped down to F/3.5.. The Mk1 is sharp as a tak across the entire field, even wide open at F/1.8... Now, If you want a real good lens in this focal length, the 50mm F/1.4 USM or the 50mm F/1.2L are astounding..
I agree, im sort of old school in the fact that I think every photographer should have a 50mm prime lens in their kit. I just find the nifty fifties to be somewhat inconsistent with optical quality.
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