(From Canon lens literature) The Canon EF 16-35mm f/2.8L II USM Lens is a high-performance L-series wide-angle zoom lens, specifically designed for improved peripheral image quality. Compatible with all EOS SLRs past and present, it uses three high-precision aspherical lens elements and two Ultra-Low Dispersion (UD) lens elements to minimize lateral chromatic aberration and to produce superb image quality with excellent resolution and contrast.
It features 3 high-precision aspherical lens elements, each of a different type: ground, replica, and GMO for even better image quality than the original EF 16-35mm f/2.8L USM. The circular aperture produces a beautiful and natural background blur when shooting at wider apertures.
Other features include internal focusing, a ring-type USM (Ultra Sonic Monitor), and new AF algorithms for fast and quiet autofocusing. New coatings minimize ghosting and flare. It is an internal focus design, so the front element does not rotate during focusing and zooming, a convenience for users of circular polarizer filters. The lens is also fully gasketed and sealed for dust and moisture resistance, and it features an electronic diaphragm with circular blades for natural-looking background blur effects.
With its USM (ultra-sonic motor) designation, it doesn’t get much quieter and faster when focusing the 16-35mm f/2.8L lens. A full-rack focus takes less than half a second, and point-to-point focusing is lightning quick.
The 16-35mm f/2.8L II USM has a rated close-focusing distance of 28cm (0.9 feet), but this isn’t a lens you’d typically use for macro work. The non-II lens has identical characteristics in this regard.
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