Hello there ! Sharing a little script that I found and am using for my little project in Unity : 

A script that allows to see the changes of parallax in the editor when using orthographic camera.

So when I started the project, I had to choose between 2 types of cameras : orthographic or perspective, both has it's con or pros, after trying both I finally opted for the former one. For this project it felt somehow better, mostly from a visual standpoint, I could have more control over the sprite sizes, I wanted to have pixel perfect sprites, and put them exactly where I want, well.. almost).

As I progressed I found I fatal flaw using the basic parallax script with orthographic camera, I couldn't put exactly sprites where I wanted, since as the character (camera) goes on the level, the background offset were larger and larger, and without being able to save while in runtime, I had to guess the parallax offset, and move them around with guess work. And here comes in the little script saviour, now I can move around the camera, and see all the background elements moving along with it, putting my assets exactly where I wanted !

Here is the link to the original post, with the script and details about how it works and the hows and whys they did it.

https://www.gamasutra.com/blogs/DavidDionPaquet/20140601/218766/Creating_a_paral...

Credit to David Dion-Paquet, I'm just resharing the awesome script that I found.

Have a nice day !