Canon EF 75-300mm f/4-5.6 III Telephoto Zoom Lens. 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. And buy this product you can Get Free Shipping on a Canon EF 75-300mm f/4-5.6 III Telephoto Zoom Lens - f/4 to 5.6 for $98.99 after instant rebate at Rakuten.com, a $171.01 Savings!