the custom photomode tool by otis_inf (https://www.patreon.com/Otis_Inf)
first of all you should download the camera mod itself. to access this you need to visit the author's page on patreon and purchase a monthly subscription for ~€5. then find the post with bg3 and download the necessary file (download the latest version since the previous ones are most likely incompatible with the new game patches)
reshade (https://reshade.me/)
It’s a universal tool for improving the appearance of your game with which you can create the visual of your dreams, as well as it’s a very important component and without it the camera and effects will not work. from the two download options, I recommend you choose the “full add-on support reshade build” option
IGCS connector add-on (https://github.com/FransBouma/IgcsConnector/releases)
a reshade add-on which communicates between reshade effects and otis_inf’s camera tools

scrolling to the bottom of the page you will see several files, of which you will need only the first one without the “32 bit”


