Lanphier Window /Glass

I am looking for ideas for outfitting my Dome
with a Lanphier Window. Are there any sources
for the glass or plexiglass that would have good
qualities for at least visual observing ?

Best,
Dan

Dan,

I thought I had heard that Baader Planetarium was to come out with a film for astronomical use which was clear and had high transmission properties. I do not know if it has happened, or will happen soon.

James Adams