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Fluorescence Images by Charles Mazel In September 2003 I made three night dives in Southern California, in the San Diego area. Two were on the sunken NOSC tower outside of Mission Bay, and the third was at a kelp bed off La Jolla Shores. The legs of the tower near the sea floor are carpeted with colonies of the club tip anemone, Corynactis californica. In white light these come in varieties with slightly different coloration, but in fluorescence they were phenomenally beautiful and very variable - some colonies yellow, some with orange highlights, some an intense overall orange, others with green splotches. The tower structure made a phenomenal shooting gallery, and I hardly had to move to find new and interesting subjects and tableaus. At La Jolla shores I concentrated on photographs of kelp holdfasts and strands, but the blue lights also revealed small brightly fluorescent invertebrates on the rocks, a small invert on an isolated kelp frond in the sand, and bright fluorescence in a mollusk shell. Pictures of all of these appear below. Special thanks to my good friend and diver extraordinaire Mark Thurlow for providing his boat and guidance for my first fluorescence dives in Southern California. Technical details: Camera: Nikonos V with 28 mm lens and Nikonos close-up kit Camera filter: NightSea BBCU barrier filter Electronic flash: Ikelite Substrobe 300 Excitation filters: NightSea BE5 exciter filter Film: Fujichrome Sensia ASA 400 F-stop: f4 - f8 Exposure control: TTL mode with ASA knob set to 150
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