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<blockquote data-quote="Fortkentdad" data-source="post: 579823" data-attributes="member: 24285">Thinking of getting a Nikon TC-17E II AF-S Tele-Converter - one of the stores I frequent lists two copies in their used inventory for under $200.&nbsp; New these sell for over $400 and the new version III is $570 (on sale).&nbsp; Given the 1.4 Kenko is working so well I'm wondering if I gain much.&nbsp; It does have a shorter list of lenses with which it says it is compatible.&nbsp; I'm not sure that it would autofocus on the 200-500 because I'm already at F8 with 1.4,&nbsp; the 1.7 would add another half stop and take it past the A.F. limit.&nbsp; Alternatively I could go for the Kenko 2.0 - available from B&amp;H for about $50 more (new).&nbsp; It should still A.F. on the 70-200 2.8 but not the 200-500 although it would give me a 1000mm M.F. lens (even more on the D7100).&nbsp; Hmmmm&nbsp; What have people's experience with either of these two T.C.'s been?</blockquote>

[QUOTE="Fortkentdad, post: 579823, member: 24285"] Thinking of getting a Nikon TC-17E II AF-S Tele-Converter - one of the stores I frequent lists two copies in their used inventory for under $200. New these sell for over $400 and the new version III is $570 (on sale). Given the 1.4 Kenko is working so well I'm wondering if I gain much. It does have a shorter list of lenses with which it says it is compatible. I'm not sure that it would autofocus on the 200-500 because I'm already at F8 with 1.4, the 1.7 would add another half stop and take it past the A.F. limit. Alternatively I could go for the Kenko 2.0 - available from B&H for about $50 more (new). It should still A.F. on the 70-200 2.8 but not the 200-500 although it would give me a 1000mm M.F. lens (even more on the D7100). Hmmmm What have people's experience with either of these two T.C.'s been? [/QUOTE]

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