Brian Suda 
For the last year or so, he’s been experimenting with Infrared photography (IR) using a regular iPhone.
Wrote a brief guide to the getting started and what tools he’s using.
https://optional.is/required/2023/06/27/iphone-ir-photography/
It is MUCH more accessible than you’d think. Infact, with the addition of an IR filter (for as cheap art $26), you probably have a smart phone or DSLR that works today.
We’d love to see what photos you make.
Eiríkur Orri