From the ManufacturerEquipped with an Image Stabilizer and high zoom ratio, the Canon EF 28-135mm standard zoom lens delivers sharp, natural-looking pictures virtually ever time. The lens is particularly handy for places where flashes are prohibited, as it excels in dim lighting without requiring a flash or a tripod. Other features include a ring-type USM for swift, silent autofocusing and full-time manual focusing; a close focusing distance of 20 inches; and a maximum aperture of f/3.5 to 5.6. The lens carries a one-year warranty.Focal length: 28-135mm Maximum aperture: 1:3.5-5.6 Lens construction: 16 elements in 12 groups Diagonal angle of view: 75 to 18 degrees Focus adjustment: Rear focusing system with USM Closest focusing distance: 1.6 feet Zoom system: Rotating type Filter size: 72mm Dimensions: 3.1 inches in diameter, 3.8 inches long Weight: 18.9 ouncesProduct DescriptionThe Canon EF 28-135mm f/3.5-5.6 IS USM standard zoom lens features an Image Stabilizer and high zoom ratio. With the Image Stabilizer turned on, you can obtain sharp, natural-looking pictures in dim lighting without using flash or a tripod. Very handy for places where flash is prohibited. The lens uses ring-type USM for swift, silent autofocus and full-time manual focus. Its closest focusing distance is 20 in. (50cm). Diagonal Angle of View: 75 - 18 degrees, Filter size: 72 mm, Closest Focusing Distance: 1.6 feet.