L-SeriesThe L-series is Canon’s flagship professional lens range, combining outstanding image performance and ultimate operability with dust and moisture resistant construction.Large f/1.2 ApertureThe large maximum aperture of f/1.2 provides outstanding speed for shooting in low light conditions, without the need for flash.Fast and Quiet AFThe ring-type USM uses ultrasonic frequency vibrations to drive extremely rapid autofocus with near-silent operation. A high-speed CPU and optimized AF algorithms contribute further to AF speed. Full time electronic manual focus override is available without having to switch out of AF.Super Spectra CoatingsSuper Spectra lens coatings and lens element shaping suppress flare and ghosting, more prone to occur with digital cameras due to reflection off the image sensor. Coatings also help achieve true color balance and increase contrast for vivid hi-fidelity images.Aspherical ElementThe floating optical system, which includes an aspherical lens element, suppresses aberrations and ensures excellent imaging performance.8-Bladed Circular ApertureThe circular aperture creates a shallow depth-of-field that brings attention to the subject and blurs the background, which is ideal for portraits.