- A special-purpose camera that takes a meteorological picture of clouds, etc. in the sky with the field of view of 180 degrees from the horizon.
- Can take a picture of the entire sky of 50 mm dia. circular image in a 6 x 6 cm format 120 roll film.
- Fish-eye-NIKKOR 16.3 mm f/8 lens is a modified version of 16 mm f/8 Fisheye lens (picture angle 180 degrees) produced in 1938 for meteorological photography (cloud cover measurement).