The CN7x17 KAS S P1 offers stunning 4K optical performance, features a servo drive unit and incorporates an 11-blade diaphragm to deliver softer, more attractive out of focus areas. Thanks to an impressive 7x zoom, with focal length spanning 17mm to 120 mm, and maximum T-number of T2.95, the CN7x17 KAS S P1 may be the only lens you need. A 3-group inner focus system developed for Canon lenses reduces focus breathing to an absolute minimum.