Rare Cooke Speed Panchro 50mm Blue "O" Series Vintage Cine Lens, B & H Eyemo Mount . Condition is Used, f/2, Serial #: 310723. Glass is clean and has some tiny micro-abrasions on the front element coating that won't affect the image. There are some tiny dust particles inside the lens that can be blown out. With an adapter or re-housing (TLS, Van Dieman?) it will work on 35mm movie cameras and digital movie cameras: Arri Alexa, RED, etc. Focus and iris are smooth, no grease on ...iris blades. Vintage coatings for that classic "Cooke" look.