Designed for photographers who already have strong diving skills and understand basic photographic techniques, this reference defines what advanced underwater photography is while teaching the skills necessary to create professional-quality images. Opening with a quick overview of the basics--such as exposure, focus, subject selection, and composition--the author then expands on each of these topics, showing the techniques pros use to achieve truly stunning images. A major factor in advancing beyond the basic level of underwater photography is moving from a point-and-shoot or semi-adjustable camera to using a full-featured digital SLR camera. The myriad equipment choices available when making this transition--including cameras, lenses, underwater housings, and the lighting units designed to be used with them--are explained, as are their respective advantages and shortcomings. Because both beginning and advanced underwater photographers can have equipment-related issues, a trouble-shooting section is included to ensure that minor equipment problems won't ruin a costly dive trip.