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<blockquote data-quote="Bill16" data-source="post: 351720" data-attributes="member: 15356">Well there are a few differences between the two lenses. First one is a DX and the other is a fx lens. The D lens (fx) is about $400.00 cheaper, it doesn't have a built in focus motor in the lens, and lacks the vibration reduction. The Af-s has the built in focus motor, the VR, and has internal focusing so it doesn't extend any longer than it is all the time, and like I stated it's more expensive! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" />I've heard the AF-S is suppose to be slightly sharper, but I haven't seen any evidence of that I noticed.Since the D7100 has a built in focus motor either lens will auto focus just fine and will work great on that Nikon model. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" />Correction! I was wrong! They are both FX lenses! Sorry guys for my mistake!</blockquote>

[QUOTE="Bill16, post: 351720, member: 15356"] Well there are a few differences between the two lenses. First one is a DX and the other is a fx lens. The D lens (fx) is about $400.00 cheaper, it doesn't have a built in focus motor in the lens, and lacks the vibration reduction. The Af-s has the built in focus motor, the VR, and has internal focusing so it doesn't extend any longer than it is all the time, and like I stated it's more expensive! :) I've heard the AF-S is suppose to be slightly sharper, but I haven't seen any evidence of that I noticed. Since the D7100 has a built in focus motor either lens will auto focus just fine and will work great on that Nikon model. :) Correction! I was wrong! They are both FX lenses! Sorry guys for my mistake! [/QUOTE]

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