Originally posted by HoBykoYan It seems only tamron 28-75 f2.8 here. are there any link comparing it with sigma 17-70 f2.8-4.5 macro?
Hi HoBykoYan,
I had bought a Sigma 17-70 as a possible replacement for my Tamron 28-75/2.8 for my 40th High School Reunion. I figured I could use the extra width for larger groups, yet have about the same long end for head shots and busts, and I could get away with f4.5 at the long end indoors. The Sigma was fine at the shortest FLs, but it loses f2.8 pretty fast when you start going longer. The lighting inside wasn't good enough to get satisfactory AF with the K10 (this was a couple of years ago) for most of the range of the lens. After a few minutes, I ditched the Sigma and shot the Tamron and the DA* 50-135 for the rest of the event.
But it was a good thought. . .and the Sigma is a very nice lens. . .
The Tamron was the first lens that I added when I got my DS in '05, and it will remain in my kit forever. Considerably smaller (67mm filter) than the competition in fast constant aperture zooms and sharp wide open throughout the range. I have heard that at one time there seemed to be a QC issue with these, but when I got mine, it was pretty universally praised as at least one of the best in class, including the majors.
Scott