One of the benefits of having a lens hire business is choosing and testing the new ones out. This was taken with a Samyang 8mm fisheye, an excellent lens, sharp and easy to use. The sigma 10-20 has an angle of 90 degrees, this is nearly 180 degrees. One user commented that his biggest problem for the first week was getting his feet in all the photos. The distortion obvious in interior shots hardly notices outdoors.