Incredible lens, full frame equivalent of 100 to 400mm (2.8 to 3.5). Ideal body is the new Olympus (top model) camera.
I used it on a Panasonic Lumix DMC-GM5 (see pictures).
It is only a 16Mp body and very small camera body.
Great for shallow depth of focus, like portraits!
Since getting this lens I use a full frame system for long range lenses