Fig. 2:Flex Keller with artificial sun, descending into the green unclear water. I did not use the strobe during this dive because of the bad visibility and many backscatter. — Nikon D200 Nikkor AF-S DX 12-24mm, Hugyfot housing, Peninsula Au, Lake Zurich, 3 June 2007 Nikon D200; Δt=1/60 s; f=15 mm; f/5.6; ISO 200; 3 June 2006 10:52:26
