Canon RF 10-20mm f/4 L IS STM Lens

The aspherical, Super UD, and UD lens elements (including one Aspherical UD element), which help to achieve high image quality appropriate for an L lens Highly durable dust and water resistant qualities, to withstand the rigorous conditions faced by professionals SWC (on 2 lens surfaces) and ASC (Air Sphere Coating) reduce ghosting caused by light sources within the image, a phenomenon often seen in wide-angle lenses First L series lens to feature STM motor and full-time manual focus capability, thanks to compact, lightweight focus group