The Canon EF III USM is a good choice for beginning photographers looking for a wide-angle zoom lens to capture images of sports or wildlife — and even up-close pictures where some background blurring is desired. This Canon camera lens is one of the smallest and most lightweight 4x zoom ratio lenses in its class. The lens is compatible with other Canon cameras with an EF mount and has a 58-mm filter size. The aperture size on this telephoto camera lens is f/4 with a focusing distance of between 75-300 mm. The electronic lens mount on the Canon EF III USM means smooth and quiet auto-focusing, but manual focus can be used if desired. The lens element rotates while focusing. This Canon camera lens makes use of its Super Spectra coating to reduce ghosting and flare and to boost color and contrast readings while capturing images. The zoom ring on this telephoto camera lens looks especially nice with a silver ring trim.