In terms of optics, the lens is top-notch, featuring three aspherical elements and three UD elements. This combination results in highly corrected images with sharpness and accurate color rendering. Additionally, the lens has three unique coatings that effectively minimize flare and ghosting throughout the zoom range. As part of Canon’s L-series designation, the lens boasts a robust physical build. It is weather-sealed and has a fluorine coating on the exposed elements to provide further protection against challenging weather conditions.
What sets this lens apart from other ultra-wide options is its Optical Image Stabilizer. It compensates for up to 5.5 stops of camera shake, and when used with cameras that have in-body image stabilization (IBIS), it can compensate for up to 7 stops. Furthermore, the lens features Nano USM technology for fast and quiet autofocus performance. With a minimum focusing distance of just 7.9″ throughout the entire zoom range, it also allows for creative wide-angle close-up shots.
