It's a easy way to take VR Photo using cheap fisheye lense.
You need only a fisheye lens and this app.(and VR Player app to view.)
This makes 2D 360° Equirectangular VR Image.(...backward are pitch dark.)

You can upload the 360 VR Image to Facebook or ...

Sample)
https://store.hacosco.com/movies/65fe5ef2-30af-431a-adc6-4741edde9f3a
https://www.youtube.com/playlist?list=PL86K6WnuW2Yg244fAektGbGBnEDwUYfqs

Enjoy VR.