Product description magnification1 78 min view angle757 degrees minimum aperturef22 focus adjustmentautomatic manual filter size72 mm special functionswide angle zoom max view angle1145 degrees mounting typecanon ef featuresinternal focusing system hyper sonic motor hsm aspherical lens fld glass focal length8 mm 16 mm diaphragm blades7 lens construction11 groups 15 elements min focus distance24 cm optical zoom2 x zoom adjustmentmanual lens coatingsuper multi layer coating intended for3