canon ef 50mm f1 .4 usm standard medium telephoto lens for canon slr cameras
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 . specifications focal length 50mm maximum aperture f 1.4 l 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