i have one. i like it better than the Sigma 15-30 that i had before. it is not the sharpest lens, but it is decently sharp across the field at f11-f13. the 15-30 was noticeable sharper in the center than the edges and not as sharp overall as the 12-24. the 15-30 also showed lots of chromatic aberration in the corners while the 12-24 is much less noticeable. both show the typical "grain" in the out of focus areas of the image, which i don't like much, but right now, there isn't another 12mm offering that fits a Pentax.

Herb...
----- Original Message ----- From: "keller.schaefer" <[EMAIL PROTECTED]>
To: <pentax-discuss@pdml.net>
Sent: Monday, March 14, 2005 10:30 AM
Subject: Sigma 12-24



I have read this (very positive) review of the Sigma 12-24 zoom

http://194.100.88.243/petteri/pont/Reviews/a_Sigma_12-24_f4.5-5.6/a_Sigma_EX_12-24_f4.5-5.6.html

and I wonder if anybody here has tried this lens?




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