I'm looking into buying a new zoom lense. I would like to use it for nature photography (is 200mm enough? how close do you have to be to get a good shot?) as well as sports. Has anyone had any experience with this lense. I have looked at the sigma 70-200mm f/ 2.8 as well but it may be a bit pricy. This is more in my price range for right now. Let me know what you think about this lense I have read some mixed reviews some good some not as good but it seems it is a decent lense so far. If any one thinks otherwise let me know or give me some other suggestions for a zoom lense in the same category as this one. Thanks