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This photograph of a Blue Lined Octopus, a variant of a Blue Ringed Octopus was taken in a depth of about 10 metres at The Pipeline, Nelson Bay, NSW Australia on 13th February 2018.

I used my Nikon D500 digital SLR with a Nikon 60mm lens on manual setting and two Inon Z-240 strobes on TTL. ISO 800, 1/250th sec, aperture F14, Exposure Compensation 0.