 "Canon EF 24-70mm f/4L IS USM Zoom Lens"@en
"Canon EF 24-70mm f/4L IS USM Zoom Lens"@en 
 Lens Mount: Canon EF (EOS) Focal Length: 24-70mm Maximum Aperture: f/4 Minimum Aperture: f/22 Maximum Magnification: 0.7x Minimum Focus Distance: 1.25 ft. (0.38m) Lens Construction: 15 elements / 12 groups (2 asperical & 2 UD elements) Diaphragm Blades: 9 Focus Type: Auto / Manual Image Stabilization: Optical IS (Hybrid) Filter Size: 77mm Dimensions (Diam. x Length): 3.3 x 3.7 inches (83.4 x 93mm) Weight: 21 oz. (600g)
 "Canon EF 17-40mm f/4 L USM Lens"@en "Camera Lenses :: Canon Lens - Onestop Digital"@en
"A new and 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 inches (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 f4 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.  "@en 