Has anyone heard of a problem where Sigma's lenses don't interact with the Nikon D7000 very well? My 24-70 HSM is "jumpy" and often back-focuses. It focuses, but it will sort of jerk back and forth a few times before it settles.

Someone mentioned having it re-chipped. Anyone else have this done? Did it fix the issue?

Have you tried cleaning the contacts?

I'd say send it to Sigma. Who knows what they would do to it, or if it would involve 're-chipping' (not sure what that would entail), but they would be your best bet.

The newer lenses are flashable. However, I know that

EBH

I don't recall having seen any posts about the d7k having issues with Sigma lenses. But, there are a lot of posts about AF problems, without identifying the lenses. I tend to believe that there are some bodies out there with issues.

My d7k doesn't work well with my Sigma 100-300 f/4 or 120-300, but it doesn't involve the jumping and jerking that you describe. The lenses just won't focus properly at any distance. I haven't bothered to test my other Sigma lenses or do anything with the d7k. It seems to work fine with a Nikon lens of 200mm or higher. I haven't sent the lenses in to Sigma because they work fine on all of my other bodies.

I know that isn't real helpful, but it's the best I can do for now.

Kerry

i have the sigma 24-70 f2.8 pre hms & i will not work on my D7000 no focus at all
bounce

Send to Sigma for repair / calibration