NC> From: "Jarek Dabrowski"<[EMAIL PROTECTED]> NC> Could you tell more about Sigma 24/1.8 performance (sharpness, and flare NC> control) ? Have you used it on a full-frame SLR ?
I tried it out on film few years ago. Wide open it was nothing stellar. Also, wide open it has less relative transmission than stopped down, thus the real T stop (f stop but defined as actual light reaching the film, not theoretical amount of f stop) was slightly less than 1.8, it was more like f/2.3 lens. but used at 2.8 it wasn't bad if I remember. It didn't impress me on the whole when I compared it to such superb lenses as AIS Nikkor 2.8/24 I was using. I never owned a Pentax 24mm lens, though, so I can't compare it to these, but the 2.8 versions are said to be excellent as well. However, from my limited experience with it, if you are looking for super-fast lens for film or digital body, the wide aperture isn't usable anyway, so you might be quite better either with 2.8/24 from Pentax (or for cheaper, the 2.8/24 Sigma which was optically better than the later 1.8 in my opinion). Standard disclaimer: Your mileage may vary. Lens testing and comparisons between different people are a minefield of subjectivity. All above comments are my opinion and may apply only to the samples I actually tried out, not to all lenses of that type. ;-) Good light! fra