Matt Laur , Sep 15, 2010; 09:55 a.m.
Of course you should consider it. Probably the biggest difference is going to be in the ruggedness of the lenses. If you're out regularly working with the lens, and need it to work despite the knocking around and inevitable lumps, bumps, moist weather, etc. that heavier-duty use presents, then the Nikon lens is probably going to hold up better. For some shooting styles, the vibration control feature on the Tamron (which the Nikon doesn't have) may make a bigger difference than any other feature. After all, what good is the Nikon's stellar optics if you can't hold it still enough at the shutter speeds you use? If you can, handling them each in person will probably tell you more than anything else.