http://www.nikonchat.com/sigma-lens-or-nikkor/
"El-200mm VR Nikkor lens or Sigma 18-200mm OS lens auto focus camera 18 on the nikon d40x DSLR?
autofocus photography Nikon D40 Nikkor 18-200mm VR Sigma 18-200mm OS Sigma nikon nikkor action shots
Both the nikon 18-200 vr and 18-200mm OS Sigma lens with auto focus D40x. Both objectives have been incorporated in the motor concentration, the Nikon AF-S, while Sigma HSM (hypersonic motor). This Sigma lens website for http://www.sigmaphoto.com/lenses/lenses_all_details.asp?id=3324&navigator = 6 The Nikon lens is likely to have better optical performance, but of course I also have a price that is pretty high too. I checked the prices in PriceGrabber and is selling for $ 644 in the us1camera.com Sigma lens is selling at buydig.com for $ 429. Basically, if you can pay the additional $ 215, worth it. But if can not, not happy with the Sigma. Sigma makes some high quality lenses, including the objectives for which there is no equivalent Nikon. I say you do not know how to spend YOUR the money that I will simply answer your question and tell you that both autofocus lenses on the Nikon D40x and costs a little more, but the Sigma is a goal worth the money. You will not do much if you resell the lens, but honestly, I have the intention to keep my glasses, so do not buy to resell. Another thought if the Sigma is what you can pay now, you can get and take pictures. How much is it worth it compared to saving for the Nikon and waiting to take pictures? I, I ge the Nikon but that's because 1) i can afford it and 2) that have lenses to cover the focal length. And in fact, just bought a Sigma 18-200 (no OS) for $ 110 off ebay to give to my nephew who is just starting out. I think it will be very happy (like me, because I just spent $ 110).
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