The Tamron SP AF70-200mm R/2.8 Di LD [IF] Macro is the newest in Tamron's long line of high quality lenses. This light weight ultra fast telephoto zoom lens has a maximum aperture of f:2.8. No matter where you zoom, this lens will retain this fast aperture, great for low light or sports photography. The built in macro feature of this lens gives great close up capabilities with a magnification ration of 1:3.1. Designed to use on both full frame and APS sized sensors and constructed with 18 lens elements in 13 groups you will be able to product razor sharp images no matter what camera body you use. Attach the included tripod mount for enhanced balance and stability. Feature packed, this lens comes standard with lens hood, case. Read the whole article here.