This Sigma APO 589101 70-200mm f/2.8 telephoto lens features OS (optical image stabilization) that helps minimize the effects of shake and vibration when shooting with your compatible Canon camera. The super multilayer coating ensures clear, sharp shots.
Why spend all that money with a Canon when you can get all the features for a lot less. The lens is heavy and can cause some stress but the quality photos are great. The photos are soft at 200 and 2.8. Drop it down to 180 and close the aperture 2 stops and it becomes crystal clear. Use a mono pod or tripod is best.