I have been using the OM-D EM5 for the last two years, and i love the rig, especially when travelling.
However i have some issues when switching to manual focus in murky waters when shooting fisheye.
I have assigned one of the Fn buttons for MF/AF that works fine. When turning the camera it will be set to infinity, that is great on the top side, but in the housing under water behind the dome it will result in images out of focus.
The thing i usually do is to focus on something two meter away just under the surface, and then switch to MF before decending.
That works if i keep the camera on during the dive, but if the camera goes into stand-by mode it will go back to infinity again.
Has anyone found a better way when using manual focus without using a focus gear?