This affordable L-series ultra-wide-angle zoom lens thats ideal for both film and digital SLRs. Superior optics are assured by the use of three aspherical lens elements, in addition to a Super UD (Ultra-low Dispersion) glass element. Optical coatings are optimized for use with digital cameras. This lens focuses as close as 11 inches (0.28m), and offers both Canons full-time manual focus and a powerful 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. Features: Three Aspheric Lenses 1 Super Ultra-low Dispersion glass element Inner/Real Focusing Full-Time Manual Focusing Circular Aperture Item Specifications: Product Description: Canon EF wide-angle zoom lens - 17 mm - 40 mm Lens System: Wide-angle zoom lens Mounting Type: Canon EF Lens Aperture: F/4.0 Focal Length: 17 mm - 40 mm Optical Zoom: 2.4 x Min Focus Range: 11 in Focus Adjustment: Automatic, manual Lens Construction: 9 group(s) / 12 element(s) Special Functions: Wide angle, zoom Filter Size: 77 m Length: 4 in Weight: 17.6 oz More details about product EF 17-40mm f/4.0L USM Zoom Lens
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