Optimized for Canon Digital SLR Cameras : f/22 to f/3.5-4.5 aperture : Minimum focus distance – 5.5 (14 cm) : Rotary Zooming System : Maximum outer diameter – 2.75 (70mm) : Dimensions – Width 2.75 x Length 2.79 (70×71.1mm) : Weight – 12.3 ounces (350 grams)