Garry&Gayle wrote:
I am considering the Tamron 18-270 and the Sigma 18-250
I will see if somebody has a side by side comparison of these on the web. I wouldn't be afraid to buy either. the tamron is 449 and sigma 329 at B&H. so unless something significant turns up I would save 120$ myself. I have the Tamron and am completely satisfied with it. I think when I bought mine it was closer to $700 however
just checked dpreview, they gave the tamron a 73 rating and the sigma a 76 rating. have no idea what those numbers indicate however. but obviously they are close. you can go there and the site has complete reviews and specs.
one thing that concerns me with that DP review. the tamron was introduced Dec 2010, the Sigma June 2012. don't know if that is the latest version of the tamron but I would "assume" that the sigma might have some additional tweaks due to advanced technology. just a guess. at this point I would go with Sigma.
I see that the sigma is not available for the sony NEX E mount so that leaves me with a Tamron at $739.
bumpy