This vintage Victor Simpson Optical 16mm projector lens with a 2.5" diameter is a rare find for movie projector enthusiasts. It is compatible with Simpson projectors and features a fixed focus type. This unit comes with its original box and is perfect for use with movie projectors. The brand, Simpson Optical, is known for quality and reliability in the projection lens industry. This unit is a must have for any collector or movie enthusiast who appreciates vintage equipment.