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Question regarding the Sigma and Tamron 100-400mm lenses on the D850 and D500
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<blockquote data-quote="snerkler" data-source="post: 668894" data-attributes="member: 44852"><p>Thanks for the reply. I think you may have misunderstood about the D850, it does not limit f4 lenses that was Tamron's somewhat baffling response to me. The D850 shares the same AF system as the D500 and AF points only start to limit at f4 with 1.7xTC (which is effectively around f6.9) in which 'only' 37 AF points are available/active. At f8 (f4 with 2xTC) you 'only' get 15 AF points available/active.</p><p></p><p>The Tamron 150-600mm is f6.3 at the long end which may explain why at longer focal lengths you are limited to 45 AF points on the D850 and D500 I've owned, and the purpose of the thread was to find out whether the Tamron/Sigma 100-400mm (which are also f6.3) also exhibit the same behaviour at the longer focal lengths. The strange thing is I previously had the D750 and according to the manual the AF points start to limit at the same apertures as the D850 and D500 (ie f4 with 1.7xTC) yet with the Tamron 150-600mm all AF points work all of the time. </p><p></p><p>It would appear the 150-600mm lenses only exhibit this behaviour with the new 153 point Nikon AF system hence why the question was raised whether it was a firmware issue and whether Tamron had released an update, but unfortunately this is when I lost a bit of faith in Tamron when they replied to me that the D850 points were limited at f4.</p></blockquote><p></p>
[QUOTE="snerkler, post: 668894, member: 44852"] Thanks for the reply. I think you may have misunderstood about the D850, it does not limit f4 lenses that was Tamron's somewhat baffling response to me. The D850 shares the same AF system as the D500 and AF points only start to limit at f4 with 1.7xTC (which is effectively around f6.9) in which 'only' 37 AF points are available/active. At f8 (f4 with 2xTC) you 'only' get 15 AF points available/active. The Tamron 150-600mm is f6.3 at the long end which may explain why at longer focal lengths you are limited to 45 AF points on the D850 and D500 I've owned, and the purpose of the thread was to find out whether the Tamron/Sigma 100-400mm (which are also f6.3) also exhibit the same behaviour at the longer focal lengths. The strange thing is I previously had the D750 and according to the manual the AF points start to limit at the same apertures as the D850 and D500 (ie f4 with 1.7xTC) yet with the Tamron 150-600mm all AF points work all of the time. It would appear the 150-600mm lenses only exhibit this behaviour with the new 153 point Nikon AF system hence why the question was raised whether it was a firmware issue and whether Tamron had released an update, but unfortunately this is when I lost a bit of faith in Tamron when they replied to me that the D850 points were limited at f4. [/QUOTE]
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Question regarding the Sigma and Tamron 100-400mm lenses on the D850 and D500
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