High-Quality Zoom. Image quality of the Canon 200-400mm f/4L IS with 1.4x Extender is on par with all the Canon L-series super telephoto primes, making it the go-to lens for serious sports and wildlife photographers. One fluorite lens element and four UD (Ultra-low Dispersion) lens elements are used to correct for chromatic aberrations and provide sharp images throughout the zoom range.

Built-In 1.4X Extender. While 400mm gets you close, sometimes it’s just not enough. The built-in 1.4x Extender is activated via switch and transforms the lens into a 280-560mm f/5.6. The optical extender has minimal effect on image quality.

Image Stabilization. The in-lens IS unit provides up to 4 stops of correction, helping to eliminate camera shake. It features three IS modes: one for static subjects, one for panning along with moving subjects, and one for applying stabilization only during exposure for following fast, erratically moving subjects.

USM Motor with Power Focus Mode. The UltraSonic autofocus motor gives fast, accurate performance in demanding situations. Also featured is a two-speed Power Focus mode that enables smooth, automatic focus shifts for filmmaking. Like other L-series super teles, there are Focus Preset and AF Stop buttons, allowing flexible configurations for a variety of uses.

Rugged Build. The magnesium-alloy chassis gives the lens a solid feel. Despite the internal 1.4X Extender, the 200-400L comes in 0.5lb lighter than the Canon 400mm f/2.8L IS II. It’s dust and water-resistant when shooting in poor conditions, and fluorine coating on front and rear lens surfaces reduces smears and fingerprints. It accepts a drop-in filter (UV included) and has a built-in tripod ring.