Summary: I cannot properly rate this lens since I only took 2 photos with it before returning it. I gave it one star because this lens cannot be used with a full-frame camera. If you intend to use this with a crop sensor, stop here and read another review.
Sigma AF 18-200mm f/3.5-6.3 DC OS Zoom Lens for Nikon D40
Nataraj "eyeDance", Amazon
22 November 2008
Summary: UPDATE: This lens ceased functioning 14 months after I bought it. The local repair shop could not fix it, and said it needed to go back to Sigma. Minimum repair price was $125, and likely higher than $150. Plus shipping. I changed my rating from 4 stars to 1 star because of this.
Summary: This could be a good lens for the money. Except that it does not autofocus with some Nikon DSLR bodies, such as the Nikon D40X. I didn't see in the ad that it doesn't autofocus with some Nikon DSLRs, nor is this indicated in the information that came with the lens.
Summary: I was looking for an 18-200mm lens for my Nikon D50 SLR camera. Sigma is a recognizable trade name for lenses and the price of under $200 was appealing. The lens appeared to be what I wanted, however, the images showed significant "barrel" distortion and the expected maximum image magnification of...
Summary: premetto che non sono un fotografo professionista, anche se mi diverto a scattare fotografie da oltre 15 anni.
Ho acquistato uno zoom con una estensione così ampia poiché ero impaurito dal cosidetto fenomeno della polvere sul sensore con il cambio frequente l'ottica ed utilizzando spesso la macchina...
Cons: scarsa risoluzione ai bordi, immagini piatte, nitidezza inesistente, lenta e rumorosa messa a fuoco