The Rodenstock Rodagon 150mm f5.6 is an enlarging lens for 4×5 negatives. Very light internal haze, minor dust, clean diaphragm. A classic enlarging lens in good shape. Includes front and rear caps, no retaining ring. Note that this is not the standard 39mm lens thread: it’s M50x0.75, which is not unusual for larger lenses and enlarger boards.