 "EF 50mm f/1.4 USM"@en "Canon EF USM | Canon Online Store"@en
"Standard & Medium Telephoto Lens"@en 
 Focal Length & Maximum Aperture 50mm 1:1.4 Lens Construction 7 elements in 6 groups Diagonal Angle of View 46° Focus Adjustment Overall linear extension system with USM Closest Focusing Distance 0.45m / 1.5 ft. Filter Size 58mm Max. Diameter x Length, Weight 2.9" x 2.0", 10.2 oz. / 73.8 x 50.5mm, 290g
 "Canon EF 100mm F2.8 USM Macro Lens"@en Lens | McBain Camera Canada"@en
"
									Autofocus lens for macro photography up to life-size (1x) magnification. Inner focusing affords a long working distance of 5.9in. (149mm) at 1x. A 3-group floating system results in excellent delineation at all focusing distances. Ring USM for silent and high-speed AF, and full-time manual focusing also provided.								"@en 