Photographers chase Yosemite’s rare moonlight rainbows

On a clear night in Yosemite, only a few times each year, the full moon hits a misty spray of the highest waterfall in the park, creating a nighttime rainbow that is visible only through a camera lens. But this year, Yosemite Falls, which normally flows until August, will be dry by June, making more moonbow sightings uncertain. Special correspondent Sandra Hughes reports.