I have a Nikon 750. Like an idiot I let it fall with a Tamron 28-70 2.8 lens. Now on autofocus it oscillates backwards and forwards through the focus point but never hits the focus point. I assume it is the lens since the body is fine with other lenses. It is ok with live view on the Tamron.

I assume it needs a repair. Any suggestions how bad or what the damage is?

  • \$\begingroup\$ 28-75mm or 24-70mm? I'm not familiar with a Tamron 28-70 f/2.8. \$\endgroup\$
    – Michael C
    Commented Dec 3, 2017 at 0:16

1 Answer 1


The only thing I can come up with that would allow CDAF (live view) to function but not PDAF would be a badly de-centered element. If it's the 28-75 I think it would be cheaper to replace it with a used one.

  • \$\begingroup\$ Sorry, I miskeyed. It is a 24 - 70 with stabilization. Quite an expensive lens. \$\endgroup\$
    – Mikets
    Commented Dec 4, 2017 at 6:23
  • \$\begingroup\$ Only thing to do is send it in for an estimate... I don't expect repair will be cheap, but it might be the best option. \$\endgroup\$ Commented Dec 5, 2017 at 18:21

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