Since the firmware update for the EOS M 2:02, the autofocus speed has subjectively shortened by at least a factor of 2. Last week I with the EOS M and a aufgesetzem 70 - made 200 / 4.0 L IS USM and a Kenko Converter 1.4 shots at an event in a football stadium. The AF instantaneously reacts with EF lenses and focuses on the point. Thus, moving objects can be picked up again. The EOS M adapter is therefore a worthwhile purchase.
