Like the title says, how to setup the OM-D for smallest AF focus target? I am missing a lot of good shots with the 100-300 lens. Particularly trying to shoot birds in flight or even when they rest. Critters are very active and mobile. It's very difficult to get good focus on them. Also, sometimes, even when I press the shutter button, the shutter does not operate, why could this be? I know that my technique probably sucks and I need to work on it, but at least I would like the hardware to work properly so I have a better chance. Thanks!