Excerpt: I have shot 3 youth basketball games with this 100mm f2 lense and have had very few sharp pics out of approx 800. I use a Canon 40D with a 135mm f2 or a 70-200 f2.8 with great success. Not happy with this 100mm f2. Not happy with the color either. Maybe I just got a bad one because I read great reviews for this lense. What can I do, Adorama?