... I use this lens on my Canon Rebel XTI as a replacement for the EF-S 18-55 1:3.5-5.6 II that come with the kit. I am generally impressed and satisfied with my purchase.
I am not qualified to discuss every aspect of the optical performance, but I can point out a few negatives that would concern the amateur:
1) It is huge! holding the camera makes my wrists sore, and It no longer fits in the carry case I use. The lens attracts a little more attention than I would like.
2) It makes a very faint high pitched noise. The noise goes away when I press the depth of field preview, or when the camera goes into powersave mode after a few minutes of inactivity. It is unaffected by the image stabilization feature. It is not loud enough to bother anyone, but when I hear it, I think of the battery getting eaten away.
3) The lens cap is difficult to put on / Easy to drop.
4) It is just a travel lens. Professionals hate that these are so popular, because they compromise optical perfection for extreme zoom range. ...
Check Amazon Price and Read More Reviews on Sigma AF 18-200mm f/3.5-6.3 DC OS (Optical Stabilizer) Zoom Lens for Nikon Digital SLR Cameras
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