The Tokina 11-20mm Mount Kit allows a user to switch between Arri PL, Nikon F, and Canon EF. There's no limit to the range of cameras you can use the Tokina 11-20mm on. Installation is simple and straight forward, requiring only some basic tools. Collimation should still be taken into consideration when swapping mounts in order to maintain proper focus accuracy. Considering the Tokina 11-20mm zoom? Mount swapping and collimation is included with all new lenses for two years, FREE, when purchased from Duclos Lenses. Need tools for installation? Check out our Precision Driver Set.