What is a fisheye lens? Is an ultrawide-angle lens that produces strong visual distortion intended to create a wide panoramic or hemispherical image. (Wikipedia) Ok let's create it 'virtually'.
What this tutorial is based on is in taking a 180x180°-squared panorama, and when seeing it flattened (not spherical 360-180°) creates a fisheye look.
How to get the best fisheye effect: Closer subject or straight lines looks better when 'fisheyed' // Take a 180x180° panorama (left-right-up-down) without moving your body // Has to be a squared pano
Note the visual distortion on the sideway buildings, improving the fisheye effect. This is because the original image derived from a spherical image (partial 360x180°) that became flattened.
Any questions or suggestions, just ask or leave a comment ;) I'm albertgarciarue on Instagram.