A very popular short telephoto lens with portrait photographers a short telephoto focal length combined with a large maximum aperture and fast autofocus speed make the ef 85mm f18 usm an ideal optic for any photographer shooting portraiture fast f18 aperture shortmedium telephoto lens usm focus motor with full time manual focus 85cm closest focusing distance 58mm filter size super spectra coatings reduce ghosting and flare a practical and portability telephoto lens the ef 85mm f18 u