Sigma 14mm f/1.8

I have a new lens, the Sigma 14mm f/1.8, and I tested it today in the Sheikh Khalifa al Nahyan Mosque in Skymkent, Kazakhstan.  I found a unique angle which, according to my local guide and the imam, had never been photographed before.  I lay down inside the mihrab -- the niche that indicates the direction of Mecca -- and shot back toward the center of the huge room using the blue shell-like design of the mihrab as a dominant foreground.  At first I shot this with the remarkable f/1.8 aperture, but because the camera was so close to the foreground, I needed more depth of field.  Even a 14mm lens has limits when it comes to depth of field.  So, not wanting to raise the ISO too high, I took this picture using f/5.6.  The sharpness of this lens is extremely impressive, even at the corners. In addition, there is very little chromatic aberration. To be honest, I could have used more depth of field at the edges, but  the color and graphic design of the architecture is so dynamic and beautiful that I'm very happy with the overall results.  My settings were 1/80, f/5.6, 1600 ISO and I hand held the camera.  Given that I was up against the wall of the niche and laying on the carpet, there was no place for a tripod.