Do you mean a prime lens (fixed focal length) or a zoom lens?If you mean zoom lens, as Brian indicated, the kit one should suffice.If it's a prime you are looking for, you have the:AF-S DX NIKKOR 35mm f/1.8G which is about $200 newAnything much shorter focal length starts to get expensive, specially if you want it to auto focus on the D5100. By more expensive I mean $500++
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