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Message: <blockquote data-quote="Chosun Juan" data-source="post: 3457976" data-attributes="member: 92780">Thanks for the replies Nmike and Hermit  :t:I read through the links - interesting that AF compatibility is a bit variable, though it seems like given the right firmware it should work with all f6.3 lenses. I don't think the Sport makes sense, but the 150-600 Contemporary, (and new Tamron?) would be interesting propositions. In the sample pictures, I think the lack of improvement in image detail above 500mm (X2.7) is because of these lenses relative softness at the 600mm end, and the technique required at this ~1600mm eq length.I wonder if the Nikon 1's would function with the 800mm f5.6? .... With its built in 1.25xTC that would make its 1000mm f7.1 an insane 2700mm eq f7.1 !!  :eek!:It seems strange that the 1's wouldn't work with TC's at least at up to around this f number .... maybe it's just firmware issues?Btw, Hermit - nice results with the native CX telezoom  :t:From what I have seen poking around on review sites etc, the iq of the J5 sensor seems right up there with the Sony RX10 III. Chosun   :gh:</blockquote>