I can't say whether the Optec's probe will work or not (I suspect it will, but the only way to know for sure is to turn on the focus verbose logging and look at the result as given in the OP). You'll need that information as it's the basis for AFC. I'd be very interested in having an f/5.5 test point! Please send me a PM and I'll bring you up to speed on what's required. First....the focus log to be sure your focus probe is being recognized.... Cheers, Doug

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