Summary: This is a wonderful all purpose lens. The quality is fantastic for the price. It's great for daily shooting, but the zoom isn't enough to handle anything more than a casual shot. I'd recommend this as a starter lens for anyone who is knew to the Canon SLR.
Summary: Excellent but to heavy it weights, but its fast and usefull ,its a smart lens i can take pictures in every condition ,it hunts only you have difficult situations like some light ray between your position and the target nad not always, and man you can see the stars trough this lens ,great quality...
Summary: I am a professional filmmaker and the majority of the video I shoot is with Canon 5D mkII DSLRs. I first purchased this lens used on craigslist. After using it a couple months I dropped it from 6 feet to concrete. It didn't survive, nor should anyone expect it to!!!
Summary: I ran the 28-70 2.8 through the paces and it's off to SIGMA for calabration after one day. I read many reports of focus issues from 2.8 through about 4.5. I rolled the dice and lost. The autofocus missed on 99% of the shots running up to about f 4.5.
Sigma 28-70mm f/2.8 EX DG review by theflyingmoose
15 February 2009
Summary: As a replacement for a kit lens (even one that was as reasonable as Pentax's 18-55), this lens seems worthy of my investment. While I'm used to really sharp images through my elderly 50mm prime, changing from regular use of a kit lens (it being convenient and auto-focus) was an eye opening...
Pros: good value, decent optical performance, seems sturdy
Sigma 28-70mm f/2.8 EX DG review by thomasjohnlynch
6 January 2009
Summary: Being new to SLR 35 and having just an XTi I am very nervous about wasting cash or not getting any value or return on a "toy part" for this hobby. I took about 2,485 pictures last year and have save and been taking digitial photography since the mid 90s when my son was first born.