Thanks useful information: 
This weekend, I attached my old four thirds mount Olympus Zuiko Digital ED 70-300 1:4-5.6 to the E-M1 via an MMF-3 adaptor and went around playing. I left the camera in "P" mode and clicked away at a whole variety of subjects. Then my lodger yelled something about a bird fluttering away on a tree outside the front window. I flung up the camera, attempted to frame the subject and took the photo.
If it looks a bit murky, that is because it was taken through a slightly dirty window.
Then he (she?) flew off and settled on the branch of a tree in the park next door.
I didn't notice his companion until I downloaded the photo onto my computer.
I must admit that I am quite impressed at how well the old four-thirds lens works on the E-M1 when coupled via the MMF-3 adaptor. The auto-focus was fairly slow, but not as slow as I was expecting it to be.
PS: Neither of these photos has been cropped.
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