Today I have without thinking snapped a photo of my Bitcoin wallet seed with my 35mm camera. I have some important shots on the roll, so I can't just pull it out of the camera (which will destroy not only seed, but the rest of photos as well).
Don't be fool and write the seed words down. Its nice that you have this "analog backup", but make sure to secure it as well. You can use micro film fwiw and still need to carefully protect it.
I hope you always remember to never hand that film to third parties... Good thing developing shops have mostly disappeared.