Fig. 25: Diving makes stupid. I did not notice at below 40 meters depth that the autofocus of my camera was not working. Focus is hardly visible with fish eye through the eyepiece. — EXIF: Nikon D200; Δt=1/2 s; f=10.5 mm; f/2.8; ISO 400; 2019-06-21 9:35:22
