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Re: What caused this rainbow to look like that?
Double rainbows are not easy to photograph largely due to the increasing lack of contrast in the secondaries; tertiary ones even harder!
The supernumerary rainbows on the underside of the main bow is certainly 'different' - not something I've noticed. Wonder if it needs to be over water as well as needing rain droplets of a particular size etc.
Physics of light besides, still a great picture.