Manufactured by Sigma for some (not all) Sigma lenses and some other specific brands. Not all camera controls work with all lenses, but I have been fortunate to use some of my Canon lenses (mostly f2.8 70-200 L) and have good focus controls on Sony a6000 series cameras (a6000, 6300 and 6500). . . I buy my Canon EF Mount Sigma lenses because I switched to Sony mirrorless systems a while ago and can now use Canon, Sigma and Sony lenses as needed. I've had great luck with the MC-11 mount, it's the best price I've found anywhere and Revain delivers promptly and is easy to deal with if there's a problem.
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