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<blockquote data-quote="GracieAllen" data-source="post: 551742" data-attributes="member: 41283">I thought I put a reply in the other night, but apparently I was wrong.........Thanks for the replies...&nbsp; When the lens seemed so quiet and the O/S so minimal I got concerned after finding out my Sigma 50-500 doesn't use the O/S on my D7200...Fortunately, the USB dock arrived the day AFTER the lens (they shipped separately for some reason), and yesterday I had a chance to use it to alter the autofocus and the O/S.&nbsp; In C1 I put the most aggressive autofocus setting and the most aggressive O/S and NOW IT FEELS LIKE A &quot;NORMAL&quot; lens to me.&nbsp; I can see and hear the O/S engage and the autofocus really snaps.....&nbsp; Big sigh of relief.......In C2 I put the fastest autofocus and the &quot;other&quot; O/S setting - the one that wasn't the most aggressive or the &quot;standard&quot; one...&nbsp; It works, but I doubt that I'd ever use it...&nbsp; In my world chasing the birds and stuff I'm chasing I either want things to snap into place or I&quot;m on a tripod and they're off...Which leads me to a question of &quot;WHY?&quot;&nbsp; What would possess Sigma to slow down the autofocus or make the stabilization NOT lock in aggressively?Also - I have a Nikon TC14e III teleconverter that I routinely use on my Nikon 500/f4.&nbsp; Rather than buying the Sigma 1.4X I thought I'd give it a try...&nbsp; NUH UH.....&nbsp; Apparently Nikon have done something so it'll only work on SOME lenses, and the Sigma AIN'T part of that &quot;some&quot;...&nbsp; I read there's a tab or some such on the mount.&nbsp; I've also read that &quot;the Nikon teleconverters do NOT get along with SOME Sigma lenses.&quot;&nbsp; So, I'm curious - is it a reasonable thing to find and remove the offending tab from the Nikon TC or will performance be significantly better with the Sigma 1.4X on the Sigma lens?&nbsp; OR, is it a total waste of time 'cause even the D810 IS NOT going to autofocus worth a darn with the Sigma 150-600 and ANY 1.4X?&nbsp; It WILL autofocus on the close-in center focus points with the 500/f4 and a 2X (which I very rarely use 'cause the image degradation is somewhat visible)...&nbsp; Anyone have thoughts on this?</blockquote>

[QUOTE="GracieAllen, post: 551742, member: 41283"] I thought I put a reply in the other night, but apparently I was wrong......... Thanks for the replies... When the lens seemed so quiet and the O/S so minimal I got concerned after finding out my Sigma 50-500 doesn't use the O/S on my D7200... Fortunately, the USB dock arrived the day AFTER the lens (they shipped separately for some reason), and yesterday I had a chance to use it to alter the autofocus and the O/S. In C1 I put the most aggressive autofocus setting and the most aggressive O/S and NOW IT FEELS LIKE A "NORMAL" lens to me. I can see and hear the O/S engage and the autofocus really snaps..... Big sigh of relief....... In C2 I put the fastest autofocus and the "other" O/S setting - the one that wasn't the most aggressive or the "standard" one... It works, but I doubt that I'd ever use it... In my world chasing the birds and stuff I'm chasing I either want things to snap into place or I"m on a tripod and they're off... Which leads me to a question of "WHY?" What would possess Sigma to slow down the autofocus or make the stabilization NOT lock in aggressively? Also - I have a Nikon TC14e III teleconverter that I routinely use on my Nikon 500/f4. Rather than buying the Sigma 1.4X I thought I'd give it a try... NUH UH..... Apparently Nikon have done something so it'll only work on SOME lenses, and the Sigma AIN'T part of that "some"... I read there's a tab or some such on the mount. I've also read that "the Nikon teleconverters do NOT get along with SOME Sigma lenses." So, I'm curious - is it a reasonable thing to find and remove the offending tab from the Nikon TC or will performance be significantly better with the Sigma 1.4X on the Sigma lens? OR, is it a total waste of time 'cause even the D810 IS NOT going to autofocus worth a darn with the Sigma 150-600 and ANY 1.4X? It WILL autofocus on the close-in center focus points with the 500/f4 and a 2X (which I very rarely use 'cause the image degradation is somewhat visible)... Anyone have thoughts on this? [/QUOTE]

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