The Canon EF 20mm f/2.8 USM is an ultra wide-angle lens for serious applications. Plus it’s easy to hold and carry at 14.3 oz. (405g). A floating rear focusing system gives sharp images at all subject distances and an ultrasonic motor (USM) enables fast, smooth and quiet autofocus. Full-time manual focus override allows for precise manual focus even when in AF mode. The minimum focus distance is 9.8 inches.