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Some of the ones I find are specks on a piece of rust. I'll take a picture with a 60mm lens, 1.4 teleconverter and +10 diopter, then zoom in on the monitor just to see if it's a nudi. I saw a white speck on a rusty flake from a wreck once and took a shot. I was shocked to see that it was a new nudibranch for me...plus another pair of another new species a half inch away. They were not visible to the naked eye.