Picked up a 67mm Rise (UK) full brown filter on eBay for use with my iPhone and figured I’d share a couple of quick pics of the results. I’m pretty impressed with how the pics turned out. You need to attach it with a filter holder which can be purchased from shopmoment.com. Since I have a 3D printer I just put one together on tinkercad and printed it out. It’s not as pretty as the moment one, but it does the job. I have the stl/gcode file for anyone interested in printing one yourself. Pics taken with iPhone 11/portrait mode. The first pic is with all my lights on/no filter. Second pic with filter on/no post processing.
(AI Hydra 32 AB + / 4 ATI T5 2 actinic 2 Blue Plus)
(AI Hydra 32 AB + / 4 ATI T5 2 actinic 2 Blue Plus)