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From the Manufacturer EF-M 22mm f/2 STM Ultra slim and compact, the new EF-M 22mm f/2 STM is an EOS M series digital camera's moderate wide-angle lens that's small and light enough to carry everywhere. Its bright f/2.0 lens aperture works well with the large sensor to provide exceptional low-light performance, as well as create beautiful background blur in portraits. An aspheric lens element delivers high resolution and high contrast. For moviemakers, the EF-M 22mm f/2 STM utilizes a built-in stepping motor to provide smooth and quiet continuous autofocus when shooting video with an EOS M series digital camera. A circular aperture (7 blades) delivers soft-focus backgrounds and a short minimum focusing distance of only 5.9 inches (0.15 meters) allows you to get closer to your subjects. Specifications Focal Length & Maximum Aperture: 22mm f/2 Lens Construction: 7 elements in 6 groups Diagonal Angle of View: 63°30' Focus Adjustment: AF with full-time manual Closest Focusing Distance: 0.49 ft./0.15m Filter Size: 1.7 in./43mm diameter Max. Diameter x Length, Weight: 2.4 x 0.9 in., approx. 3.7 oz. / 60.9 x 23.7mm, approx. 105g Sample Image Click here for larger image MTF Chart