The fish-eye effect is NOT the result of processing. This is how the shot looked when it came out of the camera. I have done a little work to enhance the sky. The lens is the Sigma (Canon fit) 15mm full frame fish-eye lens. Do not buy this for a cropped sensor it is not supposed to be used for that. You will need to get a wider angle for cropped sensors. This is a great lens for the Canon 5D. See... http://bythom.com/15lens.htm
Photographer, writer, teacher :: Live honestly. Progress through knowledge. Achieve by teaching. Communicate in writing. Speak in pictures. Every day, improve the world a little...
@scooter - no processing of the fish eye effect. That is how the shot opened up. The fish-eye gets 180 degree vision in one shot. But it creates an extreme curve in the picture to do it.
ohhh, fish-eye, I get it! LOL