Canon EF 500mm f/4.0L IS USM, 17/13 Canon EF 500mm f/4.0L IS USM. Lens structure (elements/groups): 17/13, Closest focusing distance: 4.5 m, Lens viewing angle, horizontal: 4°. AF actuator: USM. Product colour: Silver. Diameter: 14.6 cm, Filter size: 52 mm, Length: 387 mm. Magnification: 0.12X https://www.cameralabs.com/canon_ef_500mm_f4l_is_usm/ Canon EF 500mm f4L IS USM review Canon's EF 500mm f4L IS USM is a super-telephoto lens adored by wildlife and sports photographers alike. The 500mm focal length, equivalent to 800mm when mounted on a cropped-frame body, delivers decent-sized images of...