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