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| p.1 #8 · 7D will focus at F8 with the Tamron-F 1.4X TC |
I've gotten my 7D/100-400/Tamron combo to AF in One Shot, as long as I don't use the center point. Even in very poor light, I can get focus lock.
I don't think it's a workable combo in AI Servo, even in bright light. It too often ends up hunting, and very slow hunting at that.