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This shot of a Grey Nurse shark was taken on 28th April 2013 at a depth of about 24 metres at The Grotto, Big Rock, Seal Rocks, NSW Australia.

I used my Nikon D7000 digital SLR with a 12-24mm Nikon lens at a focal length of 19mm on Shutter Priority and two Inon Z-240 strobes on low manual settings. ISO 400, 1/125th sec, aperture F4, Exposure Compensation 0.