The EF 200mm f/2.8L II USM employs Canon's famous rear-focus telephoto optical design that delivers outstanding picture quality throughout its entire focusing range. Like its high-end siblings, this lens also uses two ultra-low dispersion glass elements to ensure maximum image sharpness and accurate color fidelity. Canon's advanced ultrasonic focusing motor & rear focusing design give silent, high speed autofocusing. It is perfectly suited for Canon's EOS system cameras, placing special emphasis on manual focusing capabilities.