The Ring USM (Ultrasonic Motor) utilizes ultrasonic frequency vibrations to drive responsive, near-silent high-speed autofocus. The lens features a good holding torque, stopping the focusing lens group with precision and without overshoot. A full-time manual focus override is available without the need to switch out of autofocus mode. Two UD (ultra-low dispersion) glass lens elements correct chromatic aberration, achieving high resolution and contrast without color fringing on subject outlines. Two AL aspherical lens elements suppress aberrations, ensuring high image quality at all focal lengths. The lens is equipped with a fixed, petal-type hood and a gelatin filter holder at the rear. The lens construction is entirely lead-free.

The lens construction comprises 14 elements in 11 groups. The focal length is 14mm, the maximum aperture is 1:2.8, and it has a gelatin filter holder at the rear of the lens. The closest focusing distance is 7.9 inches, and the diagonal angle of view is 114 degrees on full-frame cameras.

The use of the Ring USM (Ultrasonic Motor) technology allows for responsive and near-silent high-speed autofocus performance. The good holding torque ensures precise focusing without overshoot, and the full-time manual focus override provides added flexibility for the user. The two UD (ultra-low dispersion) glass lens elements and two AL aspherical lens elements work together to deliver high resolution, contrast, and image quality across the entire focal range, with minimal chromatic aberration and other optical aberrations.

The fixed, petal-type hood and the gelatin filter holder at the rear of the lens provide additional functionality and versatility for the user. The lead-free glass construction of the lens further emphasizes the attention to detail and environmental responsibility in the lens design.

Overall, the combination of the advanced optical design, the ultrasonic motor technology, and the practical features make this lens a compelling choice for photographers seeking high-performance, high-quality imaging capabilities.

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