Canon EF 75-300mm f/4-5.6 IS USM Telephoto Zoom Lens for Canon SLR Cameras. 75-300mm Zoom Lens , F/4.0-5.6 and Image stabilizer.The optical system, construction, and exterior are the same as the EF 75-300 mm f/4-5.6 III USM’s. The difference is that it uses a DC motor instead of a USM to drive the AF.