18-35mm autofocus question

<p>I just received a new Nikon 18-35mm lens today, and the autofocus is intermittently getting jumpy and squeaky, and the camera (D610) and lens combo won't lock onto something when it jumps and squeaks. This is happening at different focus distances. </p>

<p>I'm new to Nikon, but it doesn't seem to be working right (it certainly doesn't sound right). Do I have a bad af-s motor? Thanks for any info - I want to make sure there's a problem before I contact B&H about a return.</p>

<p>From what you are saying I would advise at least talking with them on the phone.</p>

<p>-O</p>

<p>Since this is a new 18-35mm zoom, I assume it is the AF-S version (on the left side in the image below). Some old AF-S lenses may squeal, but a new one shouldn't. And that lens has no VR to contribute to any jumpy issue.</p>

<p>I would double check by setting the D610's AF to AF-S, i.e. single servo with the center AF point only. Try to focus to a few objects at different distances, from a few feet to infinity. If that problem persists, I would call B&H to get permission for exchange.</p>

<p>This is among my favorite lenses, very affordable (due to slower aperture) and optically very good. Construction quality is decent, but I like the lighter weight.</p>

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<p>Thanks guys - I tried AF-S and it flared up again. B&H has authorized an exchange. I'm sure I'll have other questions in the coming weeks, as Nikon products are fresh territory for me after a lifetime with Canon products.</p>