I was photographing splashing water at a small waterfall in Yosemite Valley. Many times I opted for longer exposure times to smooth out the water. This time I tried something different. First, I picked a very fast shutter speed to freeze the water. Then I took a second shot out of focus. The sun reflected in the water and the second image was full of interesting reflective bubbles. In post I overlaid the second, out of focus image over the first image, aligned the images and created a mask to reveal the bubbles to my hearts content. Enjoy!