This model is based on the highly innovative tokina at x 16 28mm f28 pro fx hd slr lens it has been fully converted to a cinema lens and fits super 35mm cameras as well as cameras with aps c and smaller sized image sensors the 16 28mm zoom range offers the freedom to capture a super wide angle of view of a scene while still maintaining a tight perspective the lens features a durable all metal cine style housing with geared manual zoom focus and aperture rings for use in follow focus sys