Fig. 42: Freshwater polyps (hydra vulgaris) sitting on a sunken branch. — Nikon D200, Nikkor AF-S Micro 105mm, 2 x Sea&Sea YS-110α, Lake Zug, Restaurant Baumgarten, 31 July 2013 Nikon D200; Δt=1/250 s; f=105 mm; f/25.0; ISO 200; 31 July 2013 20:44:06
