How thin is it and it it fully-silvered or partly silvered? There are a lot of different mirrors in the Edmund Optical catalogue and there is likely one that can be cut to fit.
I have replaced a number of half-silvered mirrors in sextants with microscope cover glasses because Edmund didn't have anything thin enough. The cover glass had less than 10% reflectivity but worked fine. --scott -- Frameworks mailing list [email protected] https://mail.film-gallery.org/mailman/listinfo/frameworks_film-gallery.org
