Canon EF 17-40mm f/4L USM Wide Lens

Canon's 8806A002 is an affordable L-series ultra-wide-angle zoom lens that's 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" (0.28m), and offers both Canon's 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.

Canon 8806A002 Specifications:

• Focal Length & Maximum Aperture: 17 - 40mm;1:4
• 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 (0.28 m)
• Zoom System: Rotating type
• Filter Size: 77mm
• Max. Diameter x Length: 3.3" x 3.8" (83.5 x 96.8 mm)
• Weight: 1.1 lb (500 g)