Tamron AF 180mm f/3.5 Di SP A/M FEC LD (IF) 1:1 Macro Lens for Canon Digital SLR Cameras (Model B01E) Soft out-of-focus backgrounds and superior optical performance Internal focusing system maintains overall length during focusing Two low-dispersion glass elements compensate for chromatic aberration Autofocus and manual focus one-touch switchover mechanism Digitally integrated design for Canon AF SLR cameras