[leobakerhytch]

Even though the full-size filter would surely work with a phone camera, if you could scale it down to a form factor that clips onto the phone, I can see this selling like hot cakes. Might be one of the rare cases where influencer marketing is really effective too. Is it feasible to grind the glass at a physical scale to make that work?

All in all, very cool product, and congrats on making a living from it!