 "Canon EF 70-300mm f/4-5.6 L IS USM Zoom Lens"@en
"Canon EF 70-300mm f/4-5.6 L IS USM Zoom Lens"@en 
 Lens Mount: Canon EOS Focal Length: 70-300mm Maximum Aperture: f/4-5.6 Minimum Aperture: f/32-45 Diagonal Angle of View: 34° - 8° 15' Maximum Magnification: 0.21x Minimum Focus Distance: 3.9 ft. (1.2m) Lens Construction: 19 elements / 14 groups (2UD ultra-low dispersion glass elements) Diaphragm Blades: 8 (circular aperture) Focus Type: Auto/ Manual Filter Size: 67mm Dimensions (Diam. x Length): 3.5 x 5.6 in. (89 x 143mm) Weight: 2.31 lbs. (1050g)
 "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 