Aitch wrote:
If the D40 was free I'd consider buying the 18-200mm VR lens, you have approx 24-300mm equivalent focal lengths so you have the wide end for landscapes, the 50-80mm range for portraits and the long end for zoom shots. The value is in the quality of the lens rather than the camera body. Invest in glass, bodies come and go.
I will second this opinion. Is this the best lens out there...not hardly, however for what you will be using it for, you will have the best bang for your buck. The biggest draw for this lens is that it covers so much of the focal length spectrum without the need to change lenses. This is very important when shooting a crumb snatcher as they move fast, and you will need to react.
It has been gigged on being a soft lens, but with a little smart sharpening in Photoshop, you will be able to overcome that problem. Of course, people pictures do look a bit nicer when they are just a tad soft anyway. The biggest problem that you will likely run into is the lens creep that occurs when you have a lens that extends as far as this one does. If you point it down, the front element will most likely creep away from the resting position. Some users don't experience this problem, and for the use, I would say that it is a fair tradeoff.