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Author Message   Spydrxx Tinkerer Username: Spydrxx Post Number: 1 Registered: 06-2012 Rating: N/A Votes: 0 Posted on Saturday, June 16, 2012 - 10:57 pm:    Help! I contacted Tamron but they said it is complicated & they no longer repair this model. This was their 1st AF model Adaptall lens. I think it is just a potentiometer, but don't know. All functions work, but the AF is just slightly off at all distances. Thanks in advance.