On a Red Sea liveaboard (not very crowded), I had the chance to dive with a staff member (also a photo enthusiast) - just the two of us on a shallow reef - two parallel solo dives - spending on each coral as much time as we pleased. He was actually very happy with the opportunity to skip "regular duties" for a an hour and enjoy a calm dive.
Vassilis from Greece. Greetings to all.
Though I am a film photographer since 1970, I have recently purchased my first digital DSLR - a Nikon 7100 with an Ikelite u/w housing. A challenge, I must confess !