Crop-Frame Pancake Lens. With a focal length equivalent to 38mm after sensor crop, this ultra-small pancake lens is perfectly suited for smaller DSLRs like the SL2 up to the flagship 7D Mark II. The moderately wide focal length makes it a great general purpose, walk-around lens that can be used for all types of photography and video.

STM Autofocus Motor. This stepping autofocus motor provides fast, near-silent performance for both still and video. When used with Canon cameras that feature Movie Servo AF mode, you get continuous autofocus while shooting video(7D Mark II / 70D / C300 Dual Pixel / C100 Dual Pixel / T5i). Additionally, the aperture is is controlled by a micro-stepping mechanism that translates to near-silent adjustment.

Optics. There’s a single aspherical element in the lens design for minimizing optical aberrations and distortion, while your standard run-of-the-mill lens coatings are used to keep lens flare at bay.