My brother has one of those and I have used it a fair amount.
Seems to have nice glass (these is something about the way it renders bokha that looks different then Pentax, but not in a bad way). Build is nice and solid (it's heavy, but that's not surprising). The AF sucks on my DS, totally sluggish, but isn't bad (though slower then an 18-55) on a K10. Not having manual override (or what ever that is called) on the AF is a drag but can be lived with. The one my brother has seems to have a slight back focus problem but he hasn't done a conclusive test yet.
Macro is sweet (very handy to have good macro on a "walk around" lens).

Cheers,
Francis


www.islandlight.ca

Larry Colen wrote:
Saw an ad on CL for a Sigma 18-50mm f/2.8 EX DC SLD ELD Aspherical
Macro Lens for Pentax and Samsung Digital SLR Cameras (581109)

I don't remember seeing much mention of this lens in the "normal
zoom" discusions. What's it like? It seems reasonably fast, at least
faster than my 18-250.




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