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User Info Product Review: Canon EOS 6M; entered at 2017-05-07 15:15:14
Posts: 2539
Registered: 2008-11-14 RECALL STATE USA
"I have a Tamron 150-600mm and it refuses to run in autofocus mode with that lens at all. This is almost-certainly a compatibility issue as it's not a Canon lens; "

Although I shoot Nikon (D500) I once had a 400mm Tamron that would not autofocus on my Nikon D2X so I sent in the lens to Tamron and they put in a different chip in the lens so that it would work and it didn't cost that much. You might give that a try.
2017-05-07 15:15:14