I’d positively expect to see a rainbow when hiking the Mist Trail to Vernal Falls. It is not at all unusual to see a rainbow from the spray in Nevada Falls or Yosemite Falls. But I’ve never seen a rainbow in Bridalveil Falls before.
I quickly screwed my polarizer on the end of the lens to heighten the rainbow effect and render the colors more deeply saturated. I snapped a few captures, and then the rainbow was gone.