Quote:
Originally Posted by Dave
I've seen some excellent shots taken with the Sigma 18-50mm f/2.8 & at a 1/3 of the price of the equivalnt 17-55mm f/2.8 Nikon lens it would appear a bargain. Saying that I have the 17-55mm lens, but could only justify it as I bought it s/h. The Nikon lens really is excellent & from this quick test I did here:- Budget prime vs Premium Zoom vs Pro Zoom lens , you can see how close it gets to a prime lens......a great achievement for a zoom.
From reading this months Digital Photo mag they compared the Sigma vs thr Tamron in same focal range. Although Sigma came out on top, it was by the smallest margin, so both are excellent lenses.
I think the decision comes down to how big your budget is. For the price of a new Nikon 17-55mm lens you could get a Sigma 18-50mm, Sigma 10-20mm, Nikon 50mm f/1.8 & Nikon SB800 flashgun .....see what I mean 
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Thanks Dave, useful comments. Your last sentence has got me thinking!