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<blockquote data-quote="D200freak" data-source="post: 533775" data-attributes="member: 41018">In the teleconverter compatibility chart that Nikon publishes,&nbsp;&nbsp; they describe the combination of the 200-500mm lens and the 1.7x and 2.0x TC-17 and TC-20 (EII and EIII) as not being autofocus capable. Based on some reading I've been doing,&nbsp; Nikon apparently doesn't guarantee autofocus to work with some combinations of teleconverters and lenses only because AF requires a certain amount of lighting to work well.Well,&nbsp; I'm not having any issues with AF working in a lamp-lit room down to or below F22 with the lenses I currently have on hand.So I'm wondering,&nbsp; is the TC17 or TC20-EIII REALLY completely not AF-capable when used with the 200-500,&nbsp; or are they just covering their backsides by saying that they don't expect it to work?I have the TC14-EII which IS rated as fully functional with the 200-500.&nbsp; And while I expect to be glad for the extra range it gives me (700mm is nothing to sneeze at), I just know that if a 2x teleconverter will work with this lens, including autofocus under daylight conditions,&nbsp; then I will save up for one. So,&nbsp; if you have this lens and have tried it with a TC-17 or 20 (EII or EIII),&nbsp; please report your findings with regard to autofocus functionality and performance.</blockquote>

[QUOTE="D200freak, post: 533775, member: 41018"] In the teleconverter compatibility chart that Nikon publishes, they describe the combination of the 200-500mm lens and the 1.7x and 2.0x TC-17 and TC-20 (EII and EIII) as not being autofocus capable. Based on some reading I've been doing, Nikon apparently doesn't guarantee autofocus to work with some combinations of teleconverters and lenses only because AF requires a certain amount of lighting to work well. Well, I'm not having any issues with AF working in a lamp-lit room down to or below F22 with the lenses I currently have on hand. So I'm wondering, is the TC17 or TC20-EIII REALLY completely not AF-capable when used with the 200-500, or are they just covering their backsides by saying that they don't expect it to work? I have the TC14-EII which IS rated as fully functional with the 200-500. And while I expect to be glad for the extra range it gives me (700mm is nothing to sneeze at), I just know that if a 2x teleconverter will work with this lens, including autofocus under daylight conditions, then I will save up for one. So, if you have this lens and have tried it with a TC-17 or 20 (EII or EIII), please report your findings with regard to autofocus functionality and performance. [/QUOTE]

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