This is a vintage ELITAR SOLIGOR 8mm movie telephoto lens with a maximum aperture of f/1.9. The lens barrel is made of metal and it comes with a vintage red case. I picked this up from an estate sale, not real familiar with 8mm camera parts, so I will describe it the best I can. I do not know if anything is missing, it stands approximately 1 1/2 inches tall about 1 inch wide. The lens reads " Kodak Series IV Adapter Ring NO. 41 Made In U.S.A."....."Kodak Cine Ektanon Lens 13mm f/1.9"....."Made in U.S.A. by Eastman Kodak Co. Rochester, N.Y.". I tried to take a lot of pictures, so please look at all pictures and ask any questions before buying. Thank You!