This dust- and splashproof lens mount adapter makes it possible to mount any existing Four Thirds lens on a Micro Four Thirds standard-compliant digital camera, including Olympus OM-D Series and Olympus PEN Series models. Because of its weathersealing, this adapter is preferable to the earlier MMF-2 and MMF-1 if you will be shooting in inclement or uncertain weather. It is ideal for getting the most value out of your weathersealed and Super High Grade Four Thirds-compliant lenses. AF shooting using Live View is possible with lenses featuring contrast AF compatibility. When a contrast AF incompatible lens is used, the AF assist function engages.