"Canon EF 17-40mm f/4 L USM Zoom Lens with Tripod and 3 Filters and Backpack and Kit The Canon EF 17-40mm f/4 L USM is an affordable L-series ultra-wide-angle zoom lens thats ideal for both film and digital SLRs. Features three Aspherical lens elements and one Super UD (Ultra-low Dispersion) glass element. Focuses as close as 11 inches (0.28m) and offers both full-time manual focus and a ring-type USM for fast and silent AF. It has a constant f/4 maximum aperture and offers the choice of screw-in 77mm filters or a holder in the rear of the lens for up to three gel filters. Finally it offers weather-resistant construction similar to other high-end L-series lenses."'via Blog this'
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