My wife, Ann, in fact took this. I think her shot captures the scene beautifully as the “Maid of the Mist” approaches the Falls under the rainbow. At the time of our visit in May the rainbow effect started to occur in the middle of the afternoon, presumably when the Sun’s rays reached a critical angle with the water spray. The blue "uniforms" of the passengers on board the boat are the capes given to protect against the downpour.