The TTArtisan AF 17mm f1.8 Air is an autofocus prime lens designed for mirrorless cameras with APS-C sensors, featuring an 81 wide angle of view, a large f1.8 maximum aperture, and an STM motor for fast, quiet autofocus. Additionally, the lens has a minimum focus distance of only 0.18m. This lightweight lens is made with a durable aluminum lens body.