I have a Sigma 1.4/50 EX DG HSM which I have been using on my E5 (no adapter needed) I LOVE this lens! Now I want to use it on an O-MD. I use a Panasonic 4/3 to m4/3 adapter and it works but it is incredibly slooooooow to focus. Manual focus is fine. Child photography requires fast focus and my eyes are old and need AF. Any advice? No smart a%*#@ answers, please.