That darker spot in the middle of the rainbow is the shadow of the plane. The window distortion is unfortunately unavoidable in the lower half of the image, but I did get a shot of the only time I've seen a triple rainbow from above (this would be sundogs on the ground).
Rainbows are pretty cool things. This is the only position from which you can see a rainbow in the middle of the day (one can only see a rainbow from the ground from 3-4 hours before sunset and after sunrise) and also an arc of greater than 180 degrees (perhaps from a very tall tower?). There were brief moments of a complete circle.
Thanks for looking. No need for IQ comments ;-)
Cheers,
-Michael-







It looks like a special effect for a sci-fi movie!


