Exmouth Nudi

Added a new pic to my photoblog, more to come.

Nudibranch

That colour looks very like a fluorescent orange to me (similar to the colour produced by some Montastraea cavernosa in the Caribbean), which would explain why it was even more colourful underwater - than in the photo.

This fluorescence is excited by the blue-green light underwater, which causes the fluorescent pigments to emitt light at a different wavelength - in this case orange. Shooting this subject with white light will overwhelm the weaker fluorescent light - lessening how much it shows up in the photo.

Alex

thanks Alex for the explanation, I was wondering if you have time and wouldn't mind do you think you could add that to the comments for that pic on my photoblog ? You can add comments above the Exif data where the description is.