Originally posted by Jonson PL 
Go for the Sigma 24/1.8, or 20/1.8
I have the 24. Wide open overall color contrast is already good, but acutance is not the best and vignetting is noticeable--although the photos are definitely useable. By f/2 vignetting is noticeably lower, and by f/2.8, it seems sharp enough to pixel peep--but I didn't do ISO resolution test chart tests. photozone.de tested the 20 and didn't get good resolution results. optyczne.pl did get good results with the 20. Popphoto thought 24 was the best of the bunch. I don't know what to make of this. The one constant is that 24 has lower barrel distortion than the 20. EDIT: Oh yeah, and AF is quick on the K20D. Old reviews of these lenses should be taken with a grain of salt: the older the cameras the slower and less accurate the AF system is. It's odd that Canikonians rarely blame their cameras for focus inaccuracy--last time I checked, the lens doesn't verify whether it's in focus.
Some samples of the 24:
http://www.flickr.com/search/?w=all&q=sigma+24+1.8&m=text
Last edited by asdf; 06-17-2009 at 03:09 AM.
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