Primary, Secondary and Interference Rainbow
Mike Nicholson took this shot just after sunup on Sept 7 2006 last. He has to enhance it in PhotoShop Elements 4.0 so the colour is a bit overdone. It was shot on a Pentax *ist DS, 18-55mm lens set to 20mm. ISO was on auto (probably 200), 1/250 sec f/8. A circular polarizer was used.
Location: Papatoetoe, Auckland, New Zealand.