Close focus wide angle images I find most challenging. It's relative to capturing two images at once. First meter the background water (aperture and shutter speed)to capture the desired richness of blue, then adjust strobe power to compliment chosen aperture to properly illuminate the foreground subject.

Dive buddy "Atom Adam" is escorting mi dushi "Carlotta Mondatta" in the background while I hover around 3 feet (1 meter) away from the tube sponges. Diver Debbi can't be that far ahead.

Captured with an Oly wide angle lens and a pair of DS 125 strobes. EV manual controllers controlling strobe output complimenting my Olympus c4040 in an Ikelite housing.

Beautifully done! Carole

Beautiful!