The Olympus M.ZUIKO Digital ED 300mm f/4 IS Pro is a super-telephoto prime lens for the Micro Four Thirds mirrorless camera system. Offering an effective focal length of 600mm, up to 6 stops of image stabilisation, fast and near-silent focusing, and a manual focus clutch, read our in-depth Olympus M.ZUIKO Digital ED 300mm f/4 IS Pro review to find out if it’s the best Micro Four Thirds telephoto lens…