These lenses were designed to look like the Signature Primes which we also have in inventory. They are optically perfect, but they provide a very easy solution for creating custom looks with the easily added rear filtration that is a magnetized ring that snaps right onto the back of the lens. There are diopters which change the shape of the bokeh, or you can put on custom nets. ... https://www.arri.com/en/camera-systems/cine-lenses/arri-signature-prime-lenses