I currently have a D70 and a D200. I also own a Sigma 170-500 telephoto lens, but cannot, for the life of me, get a sharp picture using that lens with either camera. I have always been a fan of using marque lenses, but sometimes the cost of Nikon/Nikkor lenses is prohibitive, to say the least.
Have any of you guys experienced similar problems using a nikon body with non marque lenses?