Steriogram viewer for Iphone 15 Pro

I got into Stereoscopy after stumbling on a Facebook group of enthusiasts who love to create and view 3D images. It all reminded me of a toy I used to have that let me look through a binocular type device to see a set of slides arranged on a disk. The disk was advanced using a lever and each slide (which was in fact, two slides) resolved into a 3D image. There is an article on Wikipedia on the subject here https://en.wikipedia.org/wiki/Stereoscopy

What I discovered is that if you have these two so-called parallel view images side by side, it’s possible to un-focus your eyes such that you can see the 3D without any artificial device (free viewing). This however, takes concentration and is not very comfortable so I thought I would try and make my own viewer.

This design converts an iPhone into a stereo viewer, capable of viewing parallel view stereograms arranged to be precisely separated.
This was designed around an iPhone 15 pro (in a case) and it may not fit other iPhone mode