I was coming back to town after a walk. It had been sunny for my walk, but it started sprinkling as I was driving back to town. And the rainbow was pretty brilliant. I was fortunate that it stayed bright long enough that I could get to my favorite overlook.
This is a High Dynamic Range Merge of 6 images. I was using my Leica Q2, which has a 28mm fixed lens. You need a 21mm lens or wider to capture a rainbow in one exposure. Sometimes you just have to shoot with what you got.