Iridescent Cloud.

Here in Hawke's Bay, the prevailing westerly winds often produce long, high altitude rotor clouds. These clouds are commonly made of tiny ice crystals which can, when conditions are right, produce lovely iridescence. November 20, 2004 was no different, except that these were some of the brightest I have seen, so out came the camera... Photo details: Minolta camera, 1/500th second exposure with a 200mm lens @ f-10, polarising filter. Kodak Elitechrome 200 slide film.

Image taken November 20th 2004