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No, this is neither a wide angle nor a, "Fish-eye," lens. On your D40 this will work as a slight telephoto lens with almost perfectly rectalinear lines (straight lines appear straight). Try the 10.5mm Fisheye for that work.
I would recommend:
Sorry, there was a problem. Please try again later.This is not a fisheye lens. Please click on the link below for the lens simulator; it will help you to make the decision on what lens you need. http://www.nikonusa.com/Nikon-Products/Camera-Lenses/index.page#c54-CID-1296509109099-tab-2
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