This powerful ultra-wide-angle zoom lens with constant speed combines excellent precision optics with high flexibility, making it ideal for landscape and architectural photography, photojournalism, travel, or as an all-around lens - for razor-sharp wide-angle shots with minimal distortion. Professional L Series Lenses The professional L Series lenses are the flagship models in Canon's lineup and represent top-of-the-line EF precision optics. Each L Series lens features high performance, first-class handling, and high protection against dust and splashing water. Constant f/4 speed The constant f/4 speed is ideal for use in a wide range of lighting conditions, as there's no need to change exposure times or ISO settings when zooming. Razor-sharp shooting thanks to 4-stop image stabilizer The EF 16-35mm f/4L IS USM enables razor-sharp shooting in all situations, and shows its strengths especially in low-light use without a tripod or in macro settings. The lens features a Canon 4-stop optical image stabilizer that detects classic shots or panning movements and automatically selects the optimal IS mode for the shooting situation.