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Message: <blockquote data-quote="RussellHons" data-source="post: 446075" data-attributes="member: 21177">I need some help from someone that has the same or similar equipment. I shoot with a D7100 and D7200. My zoom lens are Tamron. I use the 70-200 2.8, and the 150-600 5-6.3.  I bought at Tamron SP AF Tele-coverter (300F-FNs) and the autofocus does not work on either lens. I understand that difficulty with using it on the 150-600 with the smaller aperture, but even then, the D7200 center point should autofocus at f8. I am selling the 2.0 converter, but was thinking of picking up a 1.4. Does anyone use a 1.4 with Tamron zooms and a D7xxx? Does it work? I appreciate your feed back.</blockquote>