Agreed that knowing how to backfin well is crucial in UW photography. I shoot a lot of video with a GoPro, which requires getting close. Because I wanted to get closer and get good shots, I learned how to backfin very well before I started shooting closer. So, technically, using a GoPro made me a better diver. LOL!I see too many divers, especially photographers getting too close to anything and then not knowing how to back swim, or swim in reverse, kick up the bottom after trying to turn around after taking their shots.