The Canon EF-M 22mm f/2 STM Lens is a moderate wide-angle lens exclusively designed for the EOS M Digital Camera. It features smooth and continuous AF with a built-in stepping motor and a seven-blade circular aperture. It has a minimum focusing distance of 5.9" (15 cm) and a bright f/2 aperture, which affords exceptional low-light performance. Bright f/2 aperture works well with the EOS M camera's large sensor to provide exceptional low-light performance. For movie-makers, the built-in stepping motor affords smooth and quiet continuous autofocus