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Because of the way auto focus works, when focused at or near infinity the AF points cannot accurately discriminate between edges.Hi!
I have a 18-70mm Nikon dx lens. The AF does not work most of the time at 60-70mm when focusing infinite. Is it worth having it repaired?
So if you're doing that, and it's still failing, then that's probably a broken lens. Whether you get it repaired depends on warranty, whether it's worth going without it for 2 weeks, how often you focus at infinity at 60-70mm, etc. Hard for us to say.