Summary: I have a new version of this lens, not wrinkled, and a sleek body. Before the Sigma 10mm f / 2.8 EX DC Fisheye HSM I tried to work with the Tokina 10-17mm f / 3.5-4.5 AT-X 107 AF DX Fisheye. Sigma in all respects was much higher Tokina. High sharpness, starting with 2.8. Lovely color.
Pros: High sharpness, starting with 2.8. Lovely color. Works well against the light.
Summary: I bought this lens for a STEAL of a price through Amazon's Warehouse Deals. I've never bought anything used from them before, so I was a bit skeptical and I was worried that the condition of the lens might be bad. Was I wrong! This lens only cost me a fraction of a new lens...
Summary: She loved it, used it as her primary lens on our adventures during our stay up in the North Georgia mountains over the Christmas holidays 2013. I am relating my perception of her view using the lens. She photographed some incredible panoramic shots from the highest mountain in Georgia.
Summary: You do get what you pay for here. Sharp, accurate and fast focus. What I'm most impressed with compared to other lenses is its excellent behavior outdoors under bright sun light. No flare and excellent color reproduction even with the sun in the picture.