shuppy (shuppy.org) —

fisheye lens, from wikipedia, the free encyclopedia

figure “Types of using format”[?], column “Cropped circle”, row “3:2”, link “78% FOV, 92% sensor” with tooltip text “File:3-2-circumcised.png”

section “Other applications”, item “Many planetariums now use fisheye lenses to project the night sky or other digital content onto the interior of a dome.” and item “Fish-eye lenses are used in POV pornography to make things right in front of the camera look bigger.”