<p>i had a 300/2.8 autofocus fail, not significantly different from your problem. it was $195, the shipping was almost $100 both ways, tho... i think you will only be in a couple hundred bucks if the parts are available. let us know when it is fixed. another good repair company that i have used for out of service parts is Midwest camera repair. they actually specialize in older AF lenses.</p>