Features: A thin pancake lens for EOS M series with a thickness of only 0.9 inches (23.7 mm) (when power is off) and weighs approximately 4.1 oz (105 g). The open F2 is bright and can be used in a variety of situations, such as at dusk with low light and indoor settings. The 7-blade circular aperture also features a round and beautiful bokeh flavor. Floating Focus* (near-range aberration correction mechanism) has been adopted to improve the image quality of the closest, closest shooting distance of 0.4 ft (0.15 m) and maximum shooting magnification of 0.21 x for macro expression. It is equipped with a full-time manual focus mechanism that allows for instant manual focus by simply rotating the focus ring after the one-shot AF for final focus adjustment. Floating focus is a floating mechanism that compensates for aberrations that are moved in a trajectory different from the focus group, in order to compensate for aberrations.