Thanks for the update on the lens speed,......now this explains a bit of the $1100......
Now for the kicker since I'm wanting more from my camera too, .....is the Sigma fully compatible with all the camera features ? Things like priorities... A, S, P.....etc, and can you use depth of field preview ?
For myself, I don't want to be limited to shooting at only Aperture Priority or Manual as this can sometimes be a distraction away from composition during fast action if you have to constantly read numbers in the viewfinder .....especially when light levels change a couple of EV's from east to west, or north to south during flypasts.....

I look forward to your reports and results to aid my decision on a Sigma in my future..........
