Not sure, my brother had my setup when he was traveling. If I had to guess, 150 feet. It is cropped. I'm trying to find you a shot I did this past football season. Its cropped and from 50 yards away. Looks fine.
I think what your trying to do,and the budget your at, this lens is for you. Its a great build, sturdy, fast focusing lens. It is my primary walk around lens. Other lens rarely see the camera. You can see with the top 2 pictures it creates great bokeh at 4.0 (F-Stop)