[gaseous (Patrick)]

Hopefully there are some well-informed people on this forum that can answer this for me. Is the process for creating astronomy filters such that it would preclude producing filters on an adhesive substrate rather than glass? I would assume a glass filter would produce a higher quality image, but it would be interesting, if possible, to apply an adhesive OIII/Ha (or similar) filter film to some reading glasses to see the effect under dark skies, or to create some "caps" for binoculars with filter film in them, or even to create your own filters at home that could be easily replaced if the film gets scratched. Apologies if this is the stupidest idea ever or has already been done - I owe you all 30 seconds of your life back for reading it.