Canon EF 40mm f/2.8 STM Ultra-Slim Pancake Lens for Canon Digital SLR Cameras, includes; 5pc CD Supply Accessory Kit Bright f/2.8 aperture is effective in low light situations and provides shallow depth of field focus control. High image quality from the center to the periphery thanks to its advanced lens configuration including one aspherical element. Optimized coatings that minimize ghosting and flare while providing exceptional color balance A circular 7-blade aperture for beautiful soft-focus backgrounds Mounted on a camera with an APS-C sensor, this lens offers a view similar to a 64mm lens in the 35mm format.