If you are trying to use a nice Canon L prime lens (or any EOS canon lens for that matter) on a Micro Four Thirds body or the Panasonic AG-AF150 camera, then this adapter will do the trick. Unfortunately you will lose the ability to auto-focus while using this adapter. The adapter is set up to take as much as possible from the "sweet spot" of whatever lens you use. This means minimal chromatic aberration and softness. You can still focus at infinity but you may lose some close-up capability with this adapter.