The Canon EF 24-105mm F4L IS II USM is a telezoom lens designed for the company's full-frame cameras. It has 16 elements, an Air Sphere Coating and image stabilization with 4 stops of shake reduction. The lens is sealed against dust and moisture. Product timeline Canon warns of defective focusing in some EF 24-105mm F4L IS II lenses May 18, 2017 u1EIN5q.