Oshiro 135mm f/2.8 LD UNC AL Telephoto Full Frame Prime Lens for Canon EOS Digital SLR Cameras Prime telephoto designed for both APS-C and full-frame sensors. On APS-C-sized sensors, the 35mm-equivalent focal length will be 216mm One extra-low dispersion element is incorporated within the 9 element, 7 group design, and helps to reduce chromatic aberrations for sharper, clearer image quality Manual focus design is complemented by both depth of field and distance scales for utilizing pre-focusing techniques Built-in retractable lens hood helps to shield the front lens element from stray light to prevent lens flare and ghosting All-metal body and mount, there are no plastic parts