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ePhotoZine have reviewed the Sigma 18-200mm F3.5-6.3 DC OS, the second Sigma lens to feature an Optical Stabiliser to compensate for camera shake.

“The problem with superzooms is compromise. Getting the best results from what is a stretching of optical laws to the extremes. At a zoom ratio of 11.1:1, this 18-200mm optic is a result of some well-balanced compromises though. As is usual in this type of lens, the wide end is better than the longer end in general, but does suffer some distortion. Barrel distortion is just evident at the wide end of the zoom, turning to negligible pincushion by the time the telephoto end is reached.”

http://www.ephotozine.com/article/Sigma-18-200mm-f35-63-DC-OS-1

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