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What about if there was an Alpa to FD adapter and Alpa to EOS version etc. Do you think they would work? It would save buying lots of speed boosters.

terrykim   Here is a link to calibrating for infinity   http://www.metabones.com/smart-adapter-operation-manual/155-infinity-adjustment-speed-booster-only   Any chance you could try adapters on the front of the speed booster, like a nikon/pentax adapter etc? Any one know if using adapters on the front of the speed booster causes any problems? Could you describe how well the autofocus works? Cheers.

Hi Andrew, how do you find the autofocus on the adapter? Is it worse, same, or better than the Panasonic 20mm f1.7? Do you think the adapter will work as well optically when using front adapters say a passive pentax adapter placed on the front of the EOS NEX Speed Booster?   Cheers.