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<blockquote data-quote="D200freak" data-source="post: 533904" data-attributes="member: 41018">I don't yet have my 200-500 in my hands.&nbsp; It's supposed to arrive at the store today and I pick it up when it arrives.I checked AF on my D800 using my 24-85mm at every setting down to F/22.&nbsp; &nbsp; It never missed, and that was in a room illuminated by a single 60 watt light bulb.&nbsp; &nbsp;&nbsp; So if the camera isn't supposed to have reliable AF below F/8, then I am pleased to see that my camera is an overachiever.I do know that the TC14EII is rated as fully compatible with AF functionality with the 200-500.&nbsp;&nbsp; And I have that teleconverter.But knowing myself,&nbsp; I know that if the TC17 or TC20 actually do work with it and allow AF to work, at least in daytime conditions, then I'll get one.&nbsp; &nbsp;&nbsp; But AF is pretty important to me as I'll be using the 200-500 at racetracks and airshows,&nbsp; where autofocus needs to be both fast and accurate and I will take all the zoom range I can get.&nbsp; Thus the hope that the TC20 will suit my requirements.</blockquote>

[QUOTE="D200freak, post: 533904, member: 41018"] I don't yet have my 200-500 in my hands. It's supposed to arrive at the store today and I pick it up when it arrives. I checked AF on my D800 using my 24-85mm at every setting down to F/22. It never missed, and that was in a room illuminated by a single 60 watt light bulb. So if the camera isn't supposed to have reliable AF below F/8, then I am pleased to see that my camera is an overachiever. I do know that the TC14EII is rated as fully compatible with AF functionality with the 200-500. And I have that teleconverter. But knowing myself, I know that if the TC17 or TC20 actually do work with it and allow AF to work, at least in daytime conditions, then I'll get one. But AF is pretty important to me as I'll be using the 200-500 at racetracks and airshows, where autofocus needs to be both fast and accurate and I will take all the zoom range I can get. Thus the hope that the TC20 will suit my requirements. [/QUOTE]

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