Fish-Eye Effect

[Cairnhill]

How can I get a 'fish-eye' effect without using a 'fish-eye' lens?

[Old_Geezer]

Try a photo editing app.

[Buenchico]

Moderator's note:
We're always a bit wary around here when a new member posts a question that seems to require a link. It's amazing how often another new member pops up with a solution to the problem. (i.e. it's the 2-part spam trick). So this thread will be removed if such a secondary post appears.

However, assuming the question to be genuine, download and install GIMP
https://www.gimp.org/
and then follow these instructions

https://www.youtube.com/watch?v=u_4q2eKnYB0