|
Hi Max.
Thermal currents in the tube would only cause the image to wavier. As for premium coatings, I would assume the mirror has a brighter reflective coating but it shouldn't have any yellowing. GSO do overcoat the aluminium with Silicone. It might be, and I'm only assuming this, that the Silicone overcoating may be dirty and need cleaning.
Cheers!
|