Cool short documentary on gear for filming bioluminescence

This neat short film explains the specialized split-beam camera Martin Dorhn developed to film bioluminescent animals without disturbing them. As the information comes through the lens, it's split so one camera captures infrared and the other captures the bioluminescence.

Then they are combined to impressive effect in David Attenborough's Light On Earth:

The Making of Light On Earth (via Vimeo)