This is an Olympus-made lens that is equipped with an Olympus/Panasonic Micro 4:3 mount. It could be the perfect thing if you're looking for a prime lens.
From London Camera Exchange
Olympus M.Zuiko DIGITAL ED 17mm F1.2 PRO Lens
HDEW Cameras
Olympus M.Zuiko Digital ED 17mm F1.2 PRO
This product is also available at 3 unverified stores.