The product is a 17-inch (430mm) Kodak Copying Ektanon f10 Coated Large lens in great shape, produced by Eastman Kodak Company in New York. This vintage lens is designed for photography and filming purposes, offering sharp images and reliable quality. Perfect for collectors or enthusiasts looking to add a unique and classic lens to their vintage camera gear collection. All visual threads are perfect lens is clear aperture functions great please see video and pictures and shoot me a message if you have any comments of questions on this lens thank you for looking