Last week I went up to Kitt Peak National Observatory to visit my friend Jim, seen here in the lower part of the image, in shadow. We were going to compare my 20mm lens to Jim's 24mm, both Sigma asphericals. Here, we are waiting for sunset. Note the pinkish-orange hue to the scene. In the background from right to left are the 4-meter, the 90" and the 36" Spacewatch 1 telescope domes. To bring up Jim's shaded face, I applied a 50% gradient from top to bottom and stretched the levels in Photoshop. Canon 20D - 1/20th, 18mm @ f/22, ISO 400