Axel
singleshooter
But - what is the real advantage above carrying two additional lenses or a small zoomlens for the M9?...mm lens and a 40mm lens, the perspective or the crop will be 28-40-56-80 depending on which lens is used with which sensor sized camera.
Look here
(Sure there are smaller bodies for mft but top of the line grows bigger and heavier. And top of the line is where I count the M9)