VRO's process is considerably more sophisticated, as they do the silicon nitride protective coating. I believe the specific approach on VRO is similar to the one pioneered for gemini: https://www.gemini.edu/files/docman/websplash/websplash2004-...
Fancier protected metal (and dialectic enhanced) coatings have been common in smaller reflectors... but it's quite a big difference doing a fancy sputter coating on a 150mm object vs a 8m one! :P
VRO's process is considerably more sophisticated, as they do the silicon nitride protective coating. I believe the specific approach on VRO is similar to the one pioneered for gemini: https://www.gemini.edu/files/docman/websplash/websplash2004-...
Fancier protected metal (and dialectic enhanced) coatings have been common in smaller reflectors... but it's quite a big difference doing a fancy sputter coating on a 150mm object vs a 8m one! :P