papa wrote:
Just curious, but what's to be gained with the sigma 20mm? I have the Tokina 16-28 and it's sharpest 18-24; 20 being optimum. At 2.8 it's tack sharp and any softness along with all lens/body corrections are automatically applied with the corresponding module in Dx0 Optics Pro 10.
Yes, I know the Tokina is excellent, better in my opinion than its new Canon counterpart at a much more reasonable price. I really wanted to get the Sigma to shoot the milkyway this summer, maybe I am making a mistake I don't know maybe f/2.8 is plenty fast enough. Reviews I have read on the Sigma claim it is tak sharp in the center at f/1.4 while collecting 4X the light of the Tokina. I have another ultra wide zoom that is as sharp as the Tokina, but it is slower at f/4. The Sigma is expensive so I had to sell something in order to justify the addition of that lens