Hello, I'm about to purchase a good mid range lens and was wondering if anyone has had any experience with this new sigma EX 28-70 f2.8 AF Asperical lens? I played with it at the store and was very impressed by it. It looked to have everything i want, just wanted to see other peoples opinions of it if anyone has used it. The price tag of 399 seems fair enough for a 2.8 AF lens. Am I mistaken? Thanks in advance. Jason
