Comments about Sigma Sigma 18mm - 50mm f/3.5-5.6 DC Autofocus Aspherical Zoom Lens for Canon EOS Digital SLR Cameras:

I've used this lens for family portraits and weddings. It fits the bill for large group shots, and when I need to get wide. It is reasonably sharp for an inexpensive lens. Not as sharp as Canon's 17-40L but it's not priced to be either. My only issue is the red CA that is in nearly every image. I know when I process my pics from this lens the first thing I do in Lightroom is fix the CA.

Comments about Sigma Sigma 18mm - 50mm f/3.5-5.6 DC Autofocus Aspherical Zoom Lens for Canon EOS Digital SLR Cameras:

This is a great lens, much better than the Canon kit lens. It works great on my Canon XTI. Excellent outside, also works well inside with a flash.

Comments about Sigma Sigma 18mm - 50mm f/3.5-5.6 DC Autofocus Aspherical Zoom Lens for Canon EOS Digital SLR Cameras:

I got this lens just for the wide angle and the price. i have been pleased with it. The Front Focus is annoying because I use ND Graduated filters. other than that its great not alot of complaints

Comments about Sigma Sigma 18mm - 50mm f/3.5-5.6 DC Autofocus Aspherical Zoom Lens for Canon EOS Digital SLR Cameras:

I bought this lens as a back up wide angle and with the good reviews I was reading for such a "cheap" lens I didn't think I could go wrong. So far I must agree with all the others it has proven to be a sharp lens. Most of my pics have been taken outdoors so the f/stop doesn't bother me but I think for indoors shooting it could be an issue...but easily dealt with. The lens feels very light on my camera and does not interfere with handling while not in use. My only complaint thus far with this lens is the manual focus ring feels very loose...I don't feel it is a fault with the construction of this particular lens, just an overall design "flaw".

Comments about Sigma Sigma 18mm - 50mm f/3.5-5.6 DC Autofocus Aspherical Zoom Lens for Canon EOS Digital SLR Cameras:

This simple and inexpensive lens has for the price pretty good performance, better than the Canon kit lens. For general use I would recommend stepping up to the 17-70mm or 18-50mm 2.8ex dc that have much better performance.
There is one alternative use for this lens: Infrared and Ultraviolet Photography. For IR (using a Hoya R72 filter) you will not get hotspots and most Canon SLRs are sensitive enough to IR. This lens only has 8 elements and simple lens coating, so it actually can be used for near UV photography as well (with a B+W 403 filter). I must warn that Canon SLRs are very insensitive to UV and records on the blue channel only, so expect 30-45 second exposures on sunny days and you'll get significant IR contamination through the red and green channels. Nikon and Pentax SLRs are much more suitable for UV photography though with exposure times around 5 seconds on sunny days.

Comments about Sigma Sigma 18mm - 50mm f/3.5-5.6 DC Autofocus Aspherical Zoom Lens for Canon EOS Digital SLR Cameras:

USED IT ON A REBEL XTI NICE LENS HOWEVER WHEN I
PUT IN IN THE AL SERVO MODE IT WOULD NOT RESPOND.

Comments about Sigma Sigma 18mm - 50mm f/3.5-5.6 DC Autofocus Aspherical Zoom Lens for Canon EOS Digital SLR Cameras:

good for beginner

Comments about Sigma Sigma 18mm - 50mm f/3.5-5.6 DC Autofocus Aspherical Zoom Lens for Canon EOS Digital SLR Cameras:

For the price, it would be a great lens, if it wasn't for the front focusing issues. In fact, this was my first introduction to front focusing - and this lens had it in spades.

Construction seemed fair - but I'm no expert on that, yet. And for the price...

Comments about Sigma Sigma 18mm - 50mm f/3.5-5.6 DC Autofocus Aspherical Zoom Lens for Canon EOS Digital SLR Cameras:

Had no problems with this lens
Works well with my Canon Rebel