In 30 or 40 feet of water, these sponges are a fluorescent lime green that perfectly matches the stripe on the blenny and his "eyebrow." When the flash goes off, things are different: the sponge turns an orangish yellow with red light present, but the fish colors don't change that much. Color scientists call that a metameric match. I call it too bad.

Nikon F4, 200mm Nikkor f/4 Macro lens, Aquatica Housing, 2 Ikelite AI/n strobes, f/22, Kodak Royal Gold 100.

 
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