AF Actuator:Ring USM. Canon EF 16-35mm f/2.8L III USM Lens, USED In The Box. · EF 16-35MM F/2.8L III USM. A premium quality ultra-wide angle lens that’s designed for high optical performance. Enjoy superb edge-to-edge sharpness and a fast f/2.8 aperture that’s ideal for handheld photography in low-light.
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