So I grabbed this the other day out at a nature trail. These butterflys move fast. I was using the 4/3 40-150, and I was playing with the burst mode on the EP1. Out of 20 shots, a few of them turned out pretty sharp. The butterfly was about 8ft away in this thick flowering stuff. Focusing was difficult, because the buttefly sort of hops along the flowers and getting a good shot at the right time seemed difficult.