Turns out I can just hold the filter over my phone! | Samsung Galaxy S9+ | 1960's Rollei Infrarot Bayonet 1 filter for Rolleiflex : r/infraredphotography
Infrared Filters: How to Use Them for Stunning Photos | Urth Magazine
Infrarot Filter Fotografie | OLYMPUS DIGITAL CAMERA | Flickr
The ultimate guide to digital infrared photography [2022] - Filters, cameras and conversions - Matthias Haltenhof Photography