Summary: I might end up calling Sigma for this lens. When using this lens at the 24mm, I noticed some black shadows on the edge of my pictures while the center has no problem.
Summary: The absolute only down side to this lens is it does not have image stabilization. But if you have a very steady hand, or just make sure to shoot with a tripod it's...
Summary: I've chosen to use this lens as my primary lens, been shooting a lot of portraits lately and at times need a very wide angle lens for larger group shots.
Summary: The lens was tested quickly and unscientifically alongside Nikkor 24-85, and also Tokina 17-35 (very good lens!) and an old Tokina 28-70 (out of curiosity).