So I finally got my Sigma 10-20mm in my hot little hands, but I've noticed that the zoom ring is quite a lot stiffer than my other lenses (though the only ring-zoom lens I have is the kit lens).
It zooms smoothly, I don't hear any grinding or anything, and the tension is even throughout the zoom range... it's just very stiff. Is this just how the lens is, or should I start looking at my warranty?
