I bought this adapter so that I can use all the EF lenses that I have, but so far haven't used the adapter much. Haven't done any tests, but the few pictures I've taken with this device on my M6 look okay. Not sure how it compares with the Canon adapter, by my guess is that the Canon adapter is of better quality material and manufacturing. Still, if you just want to use some of your EF lenses occasionally with your M series camera, this will probably do as good a job as the Canon adapter.
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