FREE Shipping BOTH Ways - The Canon EF 17-40mm f/4L USM Ultra Wide Zoom Lens is perfect for both film and digital SLRs. Features & Specifications ; Three aspherical lens elements and a Super Ultra-low Dispersion glass element help create superior portraits. Optical coatings optimized for use with digital cameras. Focuses as close as 11 . Canon s full-time manual focus and ring-type USM allow for quick and quiet autofocusing. Constant f/4 maximum aperture offers screw-in 77mm filters or a holder in the rear of the lens for up to three gel filters. Water and dustproof construction. Focal length: 17mm 40mm . Maximum aperture: f/4. Lens construction: 12 elements in 9 groups. Diagonal angle of view: 104 - 57, 30 . Focus adjustment: Inner focusing system with USM. Closest focusing distance: 0.9 ft. / 0.28m. Zoom system: Rotating type. Filter size: 77mm. Dimensions: 3.3 W x 4.75 H x 3.3 D. Weight: 19 oz. Included ; Canon EF 17-40mm f/4L USM Ultra Wide Zoom Lens. Lens hood. Lens case. Zappos makes every attempt to provide accurate information for each electronic product. Manufacturer packaging and specifications may be different from the information provided. ; Please note, Zappos gladly accepts returns on all electronic products for up to 365 days from the original purchase date. In order to process your return and refund, returned electronic products must be unused and in the original condition and packaging in which it was purchased and include any manuals, cabling and accessories. Video Games, software, DVD and Blu-ray Disc must be returned unopened in their original shrink-wrap for a refund.