The Nikon Nikkor 50mm 1.4G is an update from the old 1.4D. The G means this lens has no aperture ring. And the AF-S means that this lens has faster autofocus motor and it can autofocus with entry level Nikon DSLR camera such as the Nikon D3000 or Nikon D5100. Is the update worth the extra price? See the full review here at http://www.photoseis.com/nikon-50mm-1-4g
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