This barrel lens in excellent condition with a fixed iris is unmarked, except for "Ednalite USA #174 Patented in US." It came from a photo copy machine. On a view camera it makes a sharp image of infinity at approximately 100mm focal length. Based on it's fixed iris diameter divided into its approximate focal length, it should be an approximate f5.6.0 speed. To see over 200 cine-photo-audio-video-media equipment items, click on the hot link at right that says “more ads by this user.” This item is in excellent condition, but is sold as-is, no returns, so pickup and inspection in Tucson, Arizona, is preferred. Out of town buyers email with any questions and for payment and shipping options.