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I recently borrowed a Sigma lens from a friend that used it on their R6 body.  I have tried to use the lens with my R8 (and also my 60d) and it will not auto focus.  I get a red flashing box for my AF point when I try to snap the picture.  I tried th...

Question. My R8 started to auto focus recently. Not like the lens auto focus feature (that is enabled on the side of the lens) but on the view screen/through the eyehole. The point of evaluation highlights green on its own sometimes (not when I press...