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Sigma 18-200mm f3.5-6.3 DC OS

18-200OS
Review Date: Feb 23, 2008 Recommend? yes | Price paid: $430.00 | Rating: 10 

 
Pros: Excellent vacation lens. Very sharp in center at all focal lengths. Terrific build quality, fast focus, effective OS.
Cons:
Very slight off center focus but not enough to send the lens in for adjustment.

I bought this lens based on a review here http://www.pbase.com/lightrules/evfzz
The lens performs really well on my Canon 40D and I could not be more pleased. One incredible feature of this lens is that you can use a Kinko 1.5 TC with it to extend the range to 300mm and the IQ isn't really noticeably reduced! However, using the 1.5TC with the Sigma requires that I use a focus point other than the center three, top, center or bottom focus points to get proper focus on my 40D. It is reported that it works fine with other cameras. Knowing this limitation I simply choose one of the other focus points and it works perfectly even out at maximum zoom.

When using the the lens without the 1.5 TC auto focus works perfectly regardless of which focus point I use.

I also have a Nikon mount copy of this lens on my D200 and it is actually sharper then the Nikon 18-200VR and the OS was just as effective.

From a price performance perspective this lens has no peer and I highly recommend it to prospective buyers.