This Steinheil Doppelanastigmat Unofokal 13.5cm f4.5 is from a 3.25×4.25″ folding camera, but it will cover up to 4×5. Light haze, otherwise clean, considering its age. Mounted in a Compur shutter, which is in working order, though speeds are not perfect. Time and Bulb modes work well. Includes retaining ring.