Ring USM (Ultrasonic motor) uses ultrasonic frequency vibrations to drive responsive, near-silent high speed auto focus. Good holding torque stops the focusing lens group with precision without overshoot. Full time manual focus override is available without having to switch out of AF. Two UD (ultra-low dispersion) glass lens element correct chromatic aberration to achieve high resolution and contrast, without color fringing on subject outlines. Two AL aspherical lens elements suppress aberrations for high image quality at all focal lengths. Equipped with a fixed, petal-type hood and a gelatin filter holder at the rear. Only lead free glass is used in the lens construction.
Designed primarily for discerning landscape and architectural photographers, the Canon EF14mm f2.8L II USM lens is ideally suited to the EOS-1Ds Mark III’s full-frame capability. Measuring 3.7 inches in length and weighing in at under 23 ounces, this ultra-wide angle L-series prime lens is well corrected for rectilinear distortion, provides a 114-degree diagonal angle of view, and delivers high-speed autofocus with higher image quality overall including superior peripheral image quality, compared to its predecessor, the stalwart EF 14mm f2.8L USM lens.
While its large diameter, high-precision aspherical and UD elements, optimized lens element positioning, and flare and ghost-reducing lens coating ensure that this lens delivers the top optical performance in its professional class, Canon has added other features photographers have been asking for–improved dust and water resistance incorporated around the mount, switch panel and focusing ring, and a round aperture that creates a nice background blur and makes it easier to recognize an out-of-focus scene in less than brightly lit conditions.
Compatible with all EOS Digital SLR cameras. Redesigned optics including 2 high-precision Aspherical elements and 2 new UD-glass elements. Built-in lens hood; dust- and moisture-proof. 11-group, 14 element design. 114∫ diagonal view