Summary: This was just what I was hoping for. I had read pros and cons from others, but I read a review from a canon user mag that rated it a best buy for mid range zooms. I am very pleased with the performance so far. The motor for the auto focus sometimes is busy, but it is not a deal breaker. The lens gives a good end product, and the price is right. I would recommend it to a friend.
Sigma 18-125mm f/3.8-5.6 AF DC OS HSM Zoom Lens/Canon Mount
J. French, Amazon
1 January 2012
Summary: This lens is sweet, it gives the ability to have a "walk-around" lens that does what I need for the shots I take, which are mostly street scenes and architecture. I am glad I bought it and can recommend it to any amateur photographer looking to add to their kit.
Summary: I was willing to pay a few hundred more for a lens that was just what I wanted. But this one had the right specs and so I jumped. Its been great so far after about 1500 pictures. The image stabilization is really quite good and the pics sharp, especially in the middle of the aperture and zoom ranges. There can be a bit of fringing occasionally, but not too bad and easily corrected in photo processing apps that do that.
Summary: I bought this lens for my Canon 40D. I like its versatility- the zoom range of 18-125mm makes it suitable for most photographic opportunities. The lens is solidly built, and performs well. The autofocus is quick and accurate on my camera, and the image stabilization is helpful in low light. I'm happy with the image quality as well - pictures seem nice and sharp with plenty of snap.
Summary: Just received this lens. This is the first Sigma lens I got. Very good built quality. Hood is included and can be fitted front and back position. The construction is much solid compare to 18-55 kit lens. A bit better than the 28-135mm kit lens and size and weight about the same. I have not put on the lens on my 40D yet. I just like to share my first impression here. Also, the whole thing is made in Japan (including the cap).
Summary: The 18-125 easily beats any of the 18-55 Pentax kit lenses I have owned and provided sharper images than the Sigma 17-70 or the Pentax 18-135 when I compared them in the shop. Unlike most of the Pentax lenses, it is of course HSM, so the focus is quiet and assured (one of the main reasons I upgraded). I have always had very impressive results from this lens, Sigma produce some very good quality glass and compare very favourably to the original manufacturer.