May's meeting will be a good one with Charles Mazel speaking on coral fluorescence. Here's a link to a Reef Keeping article on the subject, this will explain a good bit about the subject. A few years ago Anthony Calfo was kind enough to let me borrow his photography filters while we were visiting Joe Burger after the first NERAC. I took a few pictures of Joe's tank using fluorescence photography. The idea is that you use a special spectrum of light that excites the flourescent pigments in corals and use a special filter (the yellow glasses that Vinny mentioned) to filter out extraneous light spectrum. The results are quite fascinating. Since I promised to post some photo's, here they are.
Hammer under normal light.
Same Hammer with fluorescence.
Montipora under normal light.
Same Monti with flourescence.
Caulastrea under normal light.
Same Caulastrea under flourescence.
Hammer under normal light.
Same Hammer with fluorescence.
Montipora under normal light.
Same Monti with flourescence.
Caulastrea under normal light.
Same Caulastrea under flourescence.
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