 "Canon EF 50mm f/1.4 USM Standard Lens for Canon SLR Cameras - Fixed"@en-US "Camera Lenses | EISF"@en-US
"EF Mount Lens Aperture Range: f/1.4-22 Two High Refraction Lens Elements Gaussian Optics Eliminate Astigmatism Ultrasonic Autofocus Motor Manual Focus Override Infrared Index Minimum Focus Distance: 17.8" Filter Thread Diameter: 58mm The 50mm f/1.4 standard lens is a terrific choice for both casual and professional photographers. The lens is outfitted with two high-refraction lens elements and new Gaussian optics, which combine to eliminate astigmatism and suppress astigmatic difference. As a result, the lens obtains crisp images with little flare even at the maximum aperture. The lens's f/1.4 speed, meanwhile, is perfect for available-light shooting. And as a bonus, this lens is the only lens in the EF system to offer an extra-small Micro Ultra Sonic Motor (USM) while still providing a full-time manual focusing option. Other features include a close focusing distance of 1.5 feet, a 58mm filter size, and a one-year warranty.what's in the boxCanon Normal EF 50mm f/1.4 USM Autofocus Lens, E-58U 58mm Snap-On Lens Cap, Lens Dust Cap E (Rear) and 1-Year Warranty.  Specifications    Focal length: 50mm   Maximum aperture: f/1.4L   Lens construction: 7 elements in 6 groups   Angle of view: 46 degrees   Focus adjustment: Overall linear extension system with USM   Closest focusing distance: 1.5 feet   Filter size: 58mm   Dimensions: 2.9 inches in diameter and 2 inches long   Weight: 10.2 ounces   Warranty: 1 year"@en-US 
 "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 