Summary: good walk around lens, excellent reach but light is compromised, switched it for the 17-50mm f/2.8 OS, now the wife uses it for when we travel, does not distort like the Nikons of the same family, have not noted any chromatic aberration, fringing, vignetting, etc... it is a very good product, you'll be happy as I was with it...
Summary: I think this is the perfect travel lens. Who really wants to switch lenses over and over on a vacation cruise or European street? I've always thought it was a pain, especially when in a group of none enthusiasts. I have found its really nice for traveling in National and State Parks, where wildlife can show up unexpectedly at different ranges. I really couldn't be happier. I upgraded from a Tamron AF 18-200mm f/3.5-6.3 XR Di II LD Aspherical (IF) (Model A14E).
Summary: I have been using the 18-55 mm kit lens together with my Pentax k-50 camera. In some cases I felt the zoom range to be slightly narrow. Googling alternatives I found the Sigma 18 - 200 mm to be an option. I found a good used lens on eBay (Japan) and ordered the lens as a test of delivery etc. The lens arrived within a week (really fast). The lens now replaces two lenses (18-55 mm and 70-200 mm). When walking in the woods it helps a lot to only carry one lens.
... a friend who had a canon 18-55 to go bad on him
warren scott barrineau, Amazon
30 September 2014
Summary: I actually ordered this for a friend who had a canon 18-55 to go bad on him. He asked my opinion on what lens I would recommend for him to buy to do pics of his son playing football. The canon lens in that size was a good bit more expensive so having good experience in the past with sigma lenses in the past I went withe the sigma. He said it worked perfectly.
Best All-in-One Super Zoom. The newest one of all. The Contemporary
22 September 2014
Summary: Best All-in-One Super Zoom The newest one of all. The Contemporary The difference between 200, 250, 270 and 300 is insignificant, I have tried them all. The difference on the picture is insignificant but the precision is not, the sharpest zoom is the 200. As you know, the larger the zoom, the largest the possibilities of a softer picture. Sigma 18-200mm F3.5-6.3 DC Macro OS HSM Contemporary For Canon The most acclaimed all-in-one super zoom lens.