Sigma 18-200mm dc mk1 os lens for nikon?

I was considering this lens as i've heard very good reviews about contrast and sharpnes not to mention build quality?

Not sure what the question is, but I've read a few things about it and they says it's better then the much pricier Nikon version, but they also say it's not very sharp between 70 and 130mm so try to avoid that.

I presume you're getting the mark 1 because it's cheaper, but you might also wanna look into the mark 2 (it should be even better if it follows logic) and maybe look into the Tamron AF 18-270mm F/3.5-6.3 Di II VC PZD it's a tad more expensive, but it has a longer reach.

Read the Verdict on the bottom of this page (if you haven't done so already)
http://www.photozone.de/...ew?start=1