Help me decide on this lens please?

[c0ps]

Someone is willing to sell me a Sigma 18-200mm OS lense for $400 canadian dollars. I have the AFS Nikon 18-135mm. Should I buy it to replace the one I have or scrap it? I hear the focus is not so crisp at mid range

 

[KmH]

There has yet to have been made an 18-200 mm lens that has truely good image quality through the entire focal range, for a reason.

The focal range is just to extreme at 11x+.

 

[JimmyO]

You already have have the 18-135 that is like the same thing. Buy a fast wide zoom like the tokina 16-50mm 2.8