The Tamron A20, 28 mm - 300 mm f/3.5-6.3, is an aspherical lens for Canon that allows you to shoot stunning close-up photographs. The image stabilization technology used in the Tamron A20 lens counters handshakes to rule out image blurs. With 18 elements in 13 groups lens construction, this aspherical lens for Canon reduces the aberrations in the captured images. The 67 mm filter of this Tamron lens offers protection from dust. The 9 diaphragm blades of this Tamron lens help you to control the amount of light that passes through the lens.