Hi all,
Just got this lens from MS colour, 1099 cash.
It is expensive for a third party lens, but i must say - this lens is outstanding. truly outstanding and a very worthy competitor to the canon 17-55. I tried 2 copies, the first was a bad copy with AF issues, so i gave it a miss and asked for a second copy.
the second copy was perfect. everything about the lens is near perfect. this thing is SHARP from edge to edge at maximum aperture at all focal lengths, and when stop down at f4 it is EXCELLENT edge to edge. distortion is present but easily correctable and minor. so is vignetting. I can say the new fld glass really works, abberations, while present at the extreme corners at 17mm, is very negligible and well controlled. build quality is better than the canon and very solid. no barrel wobbling. the hood is nice, the size is compact and the lens is light enough.
this is as close as you'll get to a perfect fast lens for aps-c SLRs. It is that good. And guess what, it is affordable! way to go sigma. two thumbs up!:thumbsup::thumbsup: