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Hi, not related, but related to the AF. I'm noticing on old lenses that the AF is sporadic, inconsistent, in short really bad. Mainly on my modified Contax lenses. I would think it's the lenses, but they are spot-on with my Mark ii. The other lenses I've tried are fine.
So there must be something with the new AF that needs to be adjusted...
With new camera releases sometimes 3rd party algorithms fail to function correctly. I had this as an issue with an old Tokina lens and heard of the same with Sigma. The correction is most likely going to come on your side, not Canons. That means sending the lens to be flashed by Conorus. That doesn't explain the 200IS though of course...