Tidal pools are a wonderful source of material for shooting macro photos. They offer life, texture, color, and mystery. Such shots can occur above, or below, the waterline. Often it is possible to shoot underwater images without an underwater camera or housing in tide pools, since they are very shallow, with a smooth surface. In other cases, the distortions of the water movement can add interesting effects to the images. The first image below is all about detail and color, with the amazing pearl-strand-like details on the purple and orange starfish. The second image has a smoother, dreamier quality, created by the surface of the water, which is relatively flat above the anemone, but more distorted in other areas of the image.
C. David Tobie