Quote:
Originally Posted by Peter Ward
Suprax as far as I can tell is a Schott borosilicate glass similar to pyrex.
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Similar in its chemical composition but it is not precision annealed nor reliably as homogeneous as pyrex. Schott have even stipulated in the past in an attempt to avoid culpability (when faced with returns) that telescope optics are
not a suggested use for this material.
If Orion (and ASA) are knowingly using suprax as a substrate then it is bordering on shameful. imho) (the wrong side of the border at that)