Reviews and Problems with Sigma 18-200mm F3.5-6.3 DC OS HSM
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good walk around lens
Genaro Goyzueta Jr., Amazon
16 December 2014
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 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.
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.
Summary: Purchased used through Amazon. Nice lens, good price used. Built well. Little fuzziness at full zoom, but very sharp in the middle of the zoom range with a small aperture. The autofocus can hunt and is a tad slow, but no worse than the kit lenses that come with the body. Glad I purchased it.
Excerpt: I received the newly released "Sigma 18-200mm F3.5-6.3 DC OS HSM" lens a couple of days ago and my initial tests have been quite impressive! I have only had a chance to do a quick direct comparison of the Sigma 18-200mm lens to the "Canon ef-s 55-250mm f/4-5.6 is ii" lens that came with my Canon SL1 DSLR.So far, the Sigma zoom lens appears to be noticeably sharper than the Canon zoom lens.
Summary: A zoom lens will not give quite the clarity of a prime, fixed focal length lens, but this Sigma — which gives great flexibility of range — is very sharp. It combines the focal lengths of the two main lenses I was using, both Pentax, and that means fewer lens changes. The major benefit of that is less chance of getting the sensor dirty. For most photographic work, this Sigma 18-200mm lens is fantastic.