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<blockquote data-quote="benhasajeep" data-source="post: 848219" data-attributes="member: 70649">I can't speak for the D750 and 150-600 but I can speak about the older Sigma 150-500 on several DSLR bodies I have (recently added D7500)..&nbsp; I have used the Sigma on D600, D800, D850, and D7500 now.&nbsp; But I believe my lens focuses a little slower than it should.&nbsp; I had to send it in under warranty for an AF repair and it came back slower.&nbsp; I complained and they stated it should not have been focusing as fast as it was.Anyway on the 2nd half of the question I have a Z8 and the 180-600z and 2x teleconverter also Nikon Z..&nbsp; For being around F/12 it does pretty well.&nbsp; But it does miss on quick or even fairly quick subjects.&nbsp; The 2x is more for still subjects with this lens.&nbsp; I do not have the Z6III but did just get a Z5II which is more similar to the Z6III, than the&nbsp; Z6 is to the Z8.&nbsp; Will set them together and see how they work.&nbsp; With a 1.4 tc you'll get another stop of light for the AF to &quot;see&quot;.</blockquote>

[QUOTE="benhasajeep, post: 848219, member: 70649"] I can't speak for the D750 and 150-600 but I can speak about the older Sigma 150-500 on several DSLR bodies I have (recently added D7500).. I have used the Sigma on D600, D800, D850, and D7500 now. But I believe my lens focuses a little slower than it should. I had to send it in under warranty for an AF repair and it came back slower. I complained and they stated it should not have been focusing as fast as it was. Anyway on the 2nd half of the question I have a Z8 and the 180-600z and 2x teleconverter also Nikon Z.. For being around F/12 it does pretty well. But it does miss on quick or even fairly quick subjects. The 2x is more for still subjects with this lens. I do not have the Z6III but did just get a Z5II which is more similar to the Z6III, than the Z6 is to the Z8. Will set them together and see how they work. With a 1.4 tc you'll get another stop of light for the AF to "see". [/QUOTE]

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