 "Canon EF 50mm f/1.4 USM Standard Lens for Canon SLR Cameras - Fixed" "Lenses | Ultimate Camera Shop"
"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" 
 "EF 50mm f/1.8 II"@en "Canon EF II | Canon Online Store"@en
"Standard & Medium Telephoto Lens"@en 
 Focal Length & Maximum Aperture 50mm 1:1.8 Lens Construction 6 elements in 5 groups Diagonal Angle of View 46° Focus Adjustment Overall linear extension system with Micromotor Closest Focusing Distance 0.45m / 1.5 ft. Filter Size 52mm Max. Diameter x Length, Weight 2.7" x 1.6", 4.6 oz. / 68.2 x 41.0mm, 130g