As title, seems like a great deal with 7 year guarantee.
This Sigma 120-400mm f/4.5-5.6 DG OS HSM APO Lens is an ultra telephoto zoom lens ideal for nature/outdoor or sports photography. This translates into an equivalent range of 192-640mm when used with an Canon digital SLR camera. The OS (Optical Stabilizer) system minimizes image blur caused by camera shake and offers the equivalent of shooting at a shutter speed 3-4 stops faster. This allows handheld telephoto zoom shooting even in poorly lit conditions.