The conversion will enable full 10fps tracking of high speed targets such as bicyclists or runners etc. Adapted they still struggle with this.
I'm adapting mine. Want to pick up a 135A only for the purpose of a light weight travel "200/2" wannabe lol
I recieved my MC-11 a couple of days ago and I've been using it with the Canon 200, prior to that I was using the metabones IV. I'm finding the MC-11 much more stable with the 200, I had a number of lock-ups with the metabones but that might be specific to my copy, it has a bit of rotational play. I haven't tested it with the Sigma however one of the drawbacks of the MC-11 is the lack of a mounting foot for large lenses that don't have their own lens foot like the Sigma. The Sigma is a heavy lens and shooting it off a tripod or monpod would not be advisable in my opinion, certainly with the earlier ARxx models.