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Message: <blockquote data-quote="Jonathan F/2" data-source="post: 396276" data-attributes="member: 1235">The AF is decent with this Neewer adapter. It's basically a Commlite knock-off adapter, with slightly different internals (more sturdier) and custom firmware. Apparently Neewer discontinued making this adapter and I was able to find it cheap. Regarding the lens, this is the 3rd copy of the Sigma 50mm 1.4 EX in Nikon mount I've tried. It's the best corrected sample in regards to AF accuracy on a Nikon DSLRs, but I believe it's also running an older firmware, which causes intermittent quirks on my DSLR bodies. On a Sony body mounted onto the adapter, none of those issues arise and I'm able to utilize this lens at it's full optical potential. It's probably a notch below the Sigma 50mm f/1.4 Art, but it has it's own strengths mainly smaller size and smoother OOF rendering.If you're interested in trying this lens out on a Sony body, I'd recommend finding either a Canon mount copy + Sigma MC-11 or getting the Sony A-mount version with the LA-EA3 adapter. The Nikon version is the least desirable, unless you also shoot Nikon DSLR bodies. I've read reports the Nikon version of this lens doesn't work with the Z bodies + FTZ adapter and I'm not sure if Sigma still does firmware upgrades for this lens, though I can't confirm that.</blockquote>