Fix the 100-300 mm f/4.5-5.6 USM Telephoto Zoom Lens to your Canon EOS (SLR) Digital Camera and capture high-quality close-up shots. This lightweight lens boasts a high-performance ring-type Ultrasonic motor and high AF speed â  ideal for shooting outdoor sports. It uses rear group focusing so the front elements never rotate during focusing, and also adds full-time manual focusing capability. With quick and quiet auto-focusing, the EF 100-300 mm zoom lens is suitable for subjects that require the versatility of telephoto zoom. Offering high optical performance, the lens facilitates focusing as close as 4.9 feet for versatile and easy subject selection. Why buy memory for your camera?