This is a Quantaray 100-150mm f/3.5 Projection Zoom Lens, designed specifically for use with Kodak Carousel and Ektagraphic 35mm slide projectors. This high-quality, made-in-Japan lens features a rack-mount design for smooth focusing and a variable focal length that allows you to adjust your image size without moving the projector. The lens is in good vintage condition and comes in its original box. Perfect for photographers, collectors, or anyone looking to enhance their slide projection setup.