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Message: <blockquote data-quote="jwstl" data-source="post: 137943" data-attributes="member: 12977"><p>Yes, the 14-24 is an FX lens but, as others are pointing out, so is the 20 f/2.8D. Unless the lens is designated as DX it's FX. The 20 f/2.8D is one of the older FX designs but it is FX. I hope you weren't confused by the D in the model number as that stands for "Distance". The D lenses where the first to tell the camera at what distance the camera was focused. The D has nothing to do with DX. Also, you will not be able to use auto-focus with this lens or your D3100 as your camera does not have a focus motor and neither does this lens. For autofocus on the D3100 you need AF-S lenses. One last point, I've heard from reliable sources that certain lenses, and this is one, actually perform better on FX bodies than DX bodies. That's opposite of what you'd expect.</p></blockquote><p></p>