The Canon EF 70-200mm f/4 L IS USM Lens is an ideal option for CanonSLR camera and Canon EOS series digital cameras. With a built-inimage stabilizer, it corrects image shakes and minimizes blurs. Thistelephoto zoom lens features an f/4 aperture for optimal performanceat any given focal length. It provides high quality images over thecomplete focal range of 200mm without changing the aperture. It featuresgyro sensors that detect unnecessary vibrations and ensure that theimage is in its correct position on the sensor or film plane. ThisCanon digital SLR camera lens features ring-type USM based on ultra-sonicfrequency vibrations to facilitate the noiseless operation of autofocus at high speeds.