I spent an hour at the Arboretum this past weekend, seeing what I could do on an overcast day. It seems to me I am traveling lighter and lighter; just one camera (Olympus E-M1), one lens (Olympus 40-150 F4), one battery, and one SD card were with me on this outing.
I am especially pleased with the two bumble bee photos that start off the series below. The shot with the bee in mid-flight was hard to get with my "older" Olympus gear. I use a single auto focus point with a manual override option (S-AF/MF). The four-way controller allows me to move the point around, though sometimes I just do things the lazy way; that is, focus using the center focus point and then recompose. My guess is that if I had better continuous autofocus with tracking (like the newest Olympus, the OM-1), I'd have a better chance of tracking and focusing on a moving bee. In this case I was actually focusing on the plant and when the bee arrived it was (lucky for me) in the same focal plane as the plant.