>> > I'll keep investigating. >> >> <http://www.cameraegg.org/yongnuo-yn-14mm-f2-8-ultra-wide-angle-prim... >> The Yongnuo lens shown on the link seems to be for the EOS mount but its AF-MF switch works in the opposite direction to Canon lenses. On Canon lenses you slide the switch towards the body for MF but on this Yongnuo lens you slide it to the body for AF. Seems a bit of an oversight by Yongnuo. Rog.