So a friend of mine who switched over to canon a while back was cleaning out his closet, and he found a Nikkor 300mm F2.8 AIS. Since I shoot Nikon(D300) he asked if I wanted it. So now...I have to figure out if it makes sense to spend $400 Cdn on a manual focus 300 2.8 thats in excellent optical condition, with a bit of wear on body of the lens...or, do I put that money into a savings pot and wait years for something like an AF 300 2.8 Manual focus doesn't bother me at all since I've still got a few lenses I use regularly that are mf. Oh, I should mention that I shoot sports and landscape. I am practiced at shooting sports in mf. predict and prefocus. Landscape would be fine for this lens since its time consuming and patient work. What would you do?