Rodrigo Weber recently asked on a comment on Flickr what I thought of my Sigma 28-70mm (available in various fittings). My reply:
I’ve had it for a good year or two now, and I can say I’m very happy with it. It’s my usual carry-around lens, and for the price, it’s a bargain all-purpose piece of kit. I use it as the bridge between my wide angle and telephoto lenses (as well as a Canon 50mm).
Other recent photos taken with this lens:
http://www.flickr.com/photos/riggzy/3148847624/
All the stage shots from the TIMO2 show: http://www.flickr.com/photos/riggzy/sets/721576115539908_80/Various photos from the 2008 RSS Christmas Concert:
http://www.flickr.com/photos/riggzy/3103079560/
http://www.flickr.com/photos/riggzy/3103059392/Sigma lenses are known for not being as sharp as Canon lenses, but it’s never been a problem for me. I’m a big fan of this and my Sigma 12-24mm.
However, this isn’t one of Sigma’s ‘HSM’ (hyper-sonic motor) lenses, so the auto-focus motor can be a bit noisy compared to other lenses, if that’s an issue. Like all Sigma lenses, the manual focus grip is rubberised and really well made (with a minimum focus distance of 0.45m). Also, on a full-frame sensor, there is some vignetting at the 28mm end, but like all vignetting it can be corrected. I like it personally!
I would definitely recommend this lens, especially for the price. Very versatile and always performs well. Hope this helps =)
— Thomas Riggs