Friend of my dads has 2 lenses he is willing to sell me. (he is going blind. old age). 1st one is a NIkon AF 35-70 2.8D that needs cleaning. has dust between the elements. 2nd one is a NIkon AF 80-200 ED2.8 that the autofocus wont work. Question is. My guess its about $50ish to clean the 1st lens. Anyone have a relative guess what the cost would be to fix the autofocus on the 2nd one? Not looking for exact, just a ball park figure.