STM is short for STepper Motor, STM is a lens equipped with a silent stepper motor, which is quieter and more power-efficient than a typical DC motor.
STM motor focusing speed is between traditional motor and USM, not too fast, but as quiet as USM. The main purpose of the STM is to allow continuous reading of the focus when shooting video. Previous lenses had to focus manually when shooting video, but STM motor lenses can focus automatically when shooting video. And there is no focusing sound when recording video, which greatly improves the awkward situation of shooting video with the camera.
Canon, a Japanese integrated group of world-leading producers of imaging and information products, specializing in imaging, optics, medical equipment, semiconductor industrial equipment and office automation products, since its establishment in 1937, after years of unremitting efforts, Canon has globalized its business and expanded into various fields.
Canon's product lineup*** is distributed in three major areas: personal products, office equipment and industrial equipment, with major products including cameras and lenses, digital cameras, printers, copiers, fax machines, scanners, broadcasting equipment, medical equipment and semiconductor production equipment.
Canon is headquartered in Tokyo, Japan, and has four regional sales headquarters in the Americas, Europe, Asia, and Japan, with 200 subsidiaries around the world employing over 100,000 people.On January 20, 2016, the Canonrumors website stated that Canon would release a new product in February. [1] On February 5, 2018, Canon Inc. announced its annual financial results for 2017, which showed that Canon Group turnover reached 4,080 billion yen in 2017, up 19.9% year-on-year, and net profit increased 60.6% year-on-year.