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This photograph of a Dwarf Minke whale was taken in a depth of just a couple of metres on the Great Barrier Reef, Australia on 17th July 2018.

I used my Nikon D500 digital SLR with a Tokina 10-17mm lens at a focal length of 10mm on manual setting using natural light. ISO 800, 1/160th sec, aperture F8, Exposure Compensation 0.