Iridescence seen from NE Boulder, Colorado in July 1994.
A 500mm telephoto lens was used with a 35mm camera.
The view is within about 10 degrees of the sun with the lens stopped
way down. When the illumination is so reduced the vivid iridescent colors
become visible as glare no longer washes out the colors.
The weather was very hot (~100 Deg F) with delicate wave clouds forming.