Hello Guys, I bought the Sigma 10-20mm f3.5 just before going on vacation. I didn't have much time to read thoroughly into shooting with wide angle lenses (but i did my share of reading before buying it). Anyway, seems to me that i am having focus and sharpness issues with this lens to the point that i have started doubting if there might be a manufacturing fault. I am using the lens on my D90 and have found it very inconsistent to focus with the"Auto Focus". I focus on the same subject and get various different values on the distance scale, although my focus point is the same in the shots. I tried various different settings and its always the same. Would appreciate some feedback Thanks Sem.