Well I picked up my Tamron 200-400 mm lens, I think its something like 630mm for the digi, not to sure on that though... First off..... YAMA MAMA! this thing is huge. :shock: I just did some test shots from standing out on my porch, and Im pretty happy with the results. It was raining a little, and horrible overcast so the lighting was the craps, but here's what came of it. About a 100 feet away. Little more then a 100 feet away, kept the original width just cropped down the top and bottom. about 300 feet away. Look at her eyes!! I think I made them like that in ps by accident, I was in a hurry, heh. Oh and incase anyone is wondering I bought the lens primarily for Wildlife, with the ocasional horse event / hockey / soccer / baseball game / etc.