Fig. 94: Freshwater polyps (hydra vulgaris) on the edge of a rock at 27 meters depth. The picture is upside down because I had to turn my camera upside down to get the picture. Hold your breath and don't move while taking the picture or the tentacles get swirled. — Nikon D200, Nikkor AF Micro 60mm, 2x Sea&Sea YS-110α, Lake Lucerne, Riedsort, 25 August 2013 Nikon D200; Δt=1/250 s; f=60 mm; f/16.0; ISO 200; 25 August 2013 18:51:57
