The Sigma 50-150mm HSM OS for Nikon.
Crutchfield Customer Review (What's this?)
After much research I settled on the sigma 50-150 as opposed to the 70- 200 for my trusty D2x. Since this model has been discontinued it was difficult to find one unused, fortunately this seller had one left. So far the lens works great on all points and in my opinion is a perfect lens for my needs as a amateur/ Pro. photographer. However on the downside it doesn't have as long of a reach as the 70-200. But that's ok with me since I don't use often enough to justify the cost. Otherwise the lens is great, the seller was easy to work with and I am happy with my purchase.
Pros: Well built, Sharp focus.