Originally Posted by suzanne pollard 
Have recently purchased a k200d with a sigma 18-55 standard lens and am VERY disillusioned with it.
Suzanne, the Sigma AF 18-55mm/F3.5-5.6 is a particularly weak performer. One came with my Pentax K100D Super. I have hardly ever used it.
2 user reviews: avg. score 3.5/10
http://www.pentaxforums.com/userreviews/showproduct.php?product=334&cat=74