USED Canon EF 16-35mm f/2.8L USM II Ultra Wide Angle Zoom Lens

This EF 16-35mm f/2.8L II USM Lens from Canon is a high performance, water-resistant, ultra wide-angle L-series zoom lens. A constant f/2.8 maximum aperture makes this an ideal lens for low-light photography and offers shallow depth of field focus control. It comes with multiple, detailed features that make it one of the most impressive wide-angle zoom lenses available, such as constant f/2.8 aperture, ultrasonic focusing, UD, and aspherical elements, etc. The optical design has been improved to offer better edge-to-edge image quality. 

In addition, it features 3 high-precision aspherical lens elements, each of a different type: ground, replica, and GMo. Its ultrasonic motor (USM) and improved AF algorithms will help the lens to focus faster and quieter. Precise manual focus is supported even in One-Shot AF mode and a truly round aperture results in pleasing background blur. All of the "L" lenses deliver optical performance equal to similar fixed focal lengths lenses and provide tight seal structures for dust and water resistance. Distortions and aberrations are remarkably small for a lens of such amazing capabilities. An included petal-style lens hood keeps unwanted light from entering the lens and causing flare and it offers a degree of protection against impact and the elements.

Qualities:

Ultra-low dispersion glass and three high-precision aspherical lens elements, each of a different type: ground, replica, GMo minimize aberrations and improve overall image quality. The EF 16-35mm f/2.8L II USM incorporates three aspherical elements to ensure corner-to-corner sharpness and clarity throughout the focal range. Two UD (Ultra Low Dispersion) elements virtually eliminate chromatic aberrations.

A ring-type Ultrasonic Motor (USM) provides quiet, fast, precision autofocusing, and predictive tracking. Excellent holding torque ensures the point of focus is reached accurately, without overshooting. Furthermore, full-time manual override is available, making it possible to adjust focus without leaving AF mode.

Full-time manual focus override (even in AF mode) is supported. 

Circular aperture diaphragm produces brilliant out-of-focus characteristics. It gives out of focus regions a softer, more uniform feel. Sharp foreground objects stand out against a smooth blurred background

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