Came across this on Amazon. Can anyone tell me if its a good deal or not. I currently have a 18-55 kit lens but want to add a zoom (initally looking at a 70-300mm Canon). I can replace the kit lens with the Sigma, but how do they compare with the Canon offerings?
http://www.amazon.co.uk/Sigma-28-70mm-70-300mm-Digital-Cameras/dp/B001LQAF7U/ref=sr_1_1?ie=UTF8&s=electronics&qid=1252429607&sr=8-1
http://www.amazon.co.uk/Sigma-28-70mm-70-300mm-Digital-Cameras/dp/B001LQAF7U/ref=sr_1_1?ie=UTF8&s=electronics&qid=1252429607&sr=8-1