Agreed on don't buy cheap 3rd party lenses.
Question: Didn't Nikon get past the issue you speak of?
Agreed on don't buy cheap 3rd party lenses.
Question: Didn't Nikon get past the issue you speak of?
So far as I know, most of the same issues exist with the Nikons. The AF system is largely mechanical using a small motor in the body and it just can't move as fast as having the motor in the lens as the canon lens do. I have been told that some of the higher end Nikon lenses do use a servo motor in the lens that's almost as fast but, Canons performance following a moving object is still better. Think sports photography where you are using a serious telephoto lens and following the wide receiver down field to try and get the shot of him mid catch. Canon does that better.
Again, the Nikon isn't bad, it's just that Canon is better. My evil twin did sports photography using manual focus Nikons for years and did great work. The Eos digital stuff makes his life easier and he gets more of the breathtaking action shots that he did however, the skill of the operator still rules the day. That said all of the current DSLR cameras are certainly better than the early ones were.
Archie N8OBM