Rainbow at Brushes

A recent 'breath of fresh air' walk took us to a local set of reservoirs in the search for new autumn tree colours. However we were not in luck for such light on the trees.
At almost the highest point a look to our right showed us the makings of a beautiful rainbow with the blackest sky imaginable. Whilst hiding from the coming onslaught of rain behind a wall, I ran off a few quick snaps being careful not to get my lens wet. Here is the result of two of the photos melded for this panoramic capture. Notice here what I had at first thought of, as a very dirty photo of noise/dirt spots on the lens or sensor but ‘no’ the lens was clean and dry, as was my sensor. So what are those white spots and streaks over the colours of the bow itself? In fact, it seems that the bright sun to my back as I took these into the black skies, lit up the fast rain droplets and that is that what we are seeing. Strangely, moments after taking these, the rainbow, rain and dark skies reverted to beautiful blue skies again (until we reached the golden trees then it went dull - of course.)
Enjoy full size.
Have a great weekend. Herb