Last November the low autumn sun created a spectacular rainbow:
Panoramic image of a very bright double rainbow.
This panorama was created from five individual expostures.
The interference rings below the primary rainbow, the brightening of the sky inside the primary and the reversed color of the secondary rainbow are clearly visible.
The area outside the primary rainbow is darker, because no light is reflected our way from the raindrops, this effect is called Alexander’s dark band:
http://www.weatherscapes.com/techniques.php?cat=optics&page=rainbowfaq
The supernomerary arcs inside the primary rainbow are created by interference.
The secondary (outer) rainbow shows a reversed order of colors compared to the primary bow.
