Covering a versatile wide-angle focal length range, theRF 15-35mm f/2.8L IS USMfromCanonis also characterized by its bright f/2.8 constant maximum aperture. This bright design enables working in available light conditions and also affords greater control over depth of field. The range of wide focal lengths suits working in a variety of situations, from landscape to documentary shooting, and this zoom is complemented by an advanced optical design that greatly reduces color fringing and distortion for high clarity and sharpness. An Air-Sphere coating has also been applied to reduce flare and ghosting for improved contrast and color fidelity when working in bright conditions.