The Sigma 18-50mm f/2.8 EX DC Macro Lens features a 7.9-inch closer focusing capabilities, and has a maximum magnification rating of 1:3, which is suitable for close-up photography. This lens is specifically designed to meet the needs of digital SLR cameras. It corrects various aberrations. This lens comes with a special coating, which assists you in getting the right colour balance with a digital camera. This lens provides an equivalent range of 28-80 mm, when used with a Canon digital SLR camera.