This Fotodiox Vizelex ND Throttle Lens Adapter allows you to use your Canon EOS EF lens on L-Mount cameras with ease. The adapter is made by Fotodiox and has a built in variable ND filter to adjust the amount of light entering the camera. Saves tons of money so you don’t have to buy different ND filters for all the different sizes of your lenses. The build quality is excellent and the adapter feels solid in your hand. Canon lenses tend to be cheaper and easier to find than LUMIX lenses so this is a great add on I just don’t use it as much as I thought I would.