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Anonymous
The new AF-S 50mm has a new optical design, probably will outperform the old non AF-S 50mm.
http://www.dpreview.com/news/0809/08092201nikkor_50mm_1_4glens.asp
>Headlining the new features is a built-in Silent Wave Motor which enables autofocus with the D60/D40x/D40 DSLRs, but the lens also boasts a brand-new optical system with 8 elements in 7 groups for improved image quality, a circular aperture diaphragm for more attractive background blur, and a barrel design which does not change length on focusing.
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