Product Name: Mount Adapter for M42x1 to ARRI PL Product Code: NP8294 Description: The Adapter allows using some Soviet Lenses such as Helios 44-2, Industar 50-2, Jupiter-11 and some others lenses with Arri PL Mount Cameras. But not every lens will fit it since it is necessary to recess the adapter into Arri PL mount to match FFD (to allow infinity focus). So, you'll be able to install any lens that is narrow enough in rear part - less than 53mm diameter. There are cut-outs on all 4 bayonet lugs to provide 4 mounting positions. Details have high-quality anodizing. Material: Aluminum Alloy Color: Black Shape: As the picture Package Include: 1pc x Mount Adapter for M42x1 to ARRI PL Suitable For: Helios 44-2, Industar 50-2, Jupiter-11 and some others lenses with Arri PL Mount Cameras