The ef 70 200 mm f28 l usm is a professionally quality fast aperture telephoto zoom lens popular with wildlife and sports photographers as well as those shooting weddings and portraiture features high performance l series telephoto zoom lens constant f28 maximum aperture four ud lens elements 15 m minimum focussing water and dust resistant eight bladed aperture ring type usm af motor the professional photographers telezoom lens a zoom as good as a prime lens one of the finest telephot