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Message: <blockquote data-quote="yauman" data-source="post: 275013" data-attributes="member: 15418">Yes, it will work with the D5100 as the lens has an internal autofocusing motor.  The D7100 can be used with older autofocus lenses that do not have an internal auto focus motor - there's a screw drive that's in the body which engages with a mating shaft in the lens to do the autofocusing.  So the D7100 can work with lenses with or without build-in autofocus motor whereas the D5100 can only work with lenses with built-in (internal) focus motors.  This Sigma lens has an internal autofocus motor.  That's the important spec you should look for when you are looking at lenses for the D5100. [ATTACH]76248[/ATTACH]</blockquote>