This is from my 2019 calender either the February or the August page.
This stereographic reprojection was generated from a spherical panorama I shot standing near the entry of the Boomerang roller coaster in the Prater amusement park in Vienna, Austria.
See the interactive version here.
Show on map
Camera Maker: SONY
Camera Model: ILCE-QX1
Exposure Time (sec): 1/40
Focal Length (mm): 7.5