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Message: <blockquote data-quote="Vinnydude" data-source="post: 234134" data-attributes="member: 17618">I recently bought my first new lens for my D5100 and did a lot of research into what works and what doesn't. The focus motor is a must. I'd also like to back up what other people are saying, and that is try and get it sent back. If it's not working then it's not working so you have every right to.I finally settled on the Sigma 17-50mm f2.8 EX DC OS HSM (hsm on sigma is the built in motor!). I've been extremely happy with it, a huge improvement on the kit lens I had <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" />But yeah, if it's not working for you, try and get it sent back.</blockquote>