Canon have an Underwater Photography Guide which shows reasons for using a digital camera over a film camera, Marine Techniques, Pre-Dive Preparations, Understanding White Balance, taking Macro Shots and Wide Angle Shots, Panorama Shots about Movies, Maintenance on the Boat and Post-Dive Maintenance.

The guide also has tips for Viewing and Sharing Images with Friends, Basic Retouching Techniques for Better Images and a Canon Water Proof Case Line-up.