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Vercingetorix
··Spam RiskI would look for a company thar repairs camera lenses or military optics.
Ar coating question.
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Braindrain
·Are they making lenses out of sapphire these days? Seems like AR made for polycarbonate lenses would not necessarily adhere properly to a contemporary watch crystal.
I'm not sure that an AR coating for a polycarbonate substrate would be ideal for a sapphire substrate. Sapphire has an extremely high refractive index.
AR coatings have been done for decades onto hi-index glass. I am not the technical guru as to how Zeiss/Schott glass differs from sapphire, but it has never been exclusive to plastic.
In fact, it had always originally been added to hi index glass to reduce the chromatic aberrations related to high refractive indexes. It's only in more modern times that they've found other uses for it such as adding it to watch crystals.
Edited:
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Dan S
·AR coatings have been done for decades onto hi-index glass. I am not the technical guru as to how Zeiss/Schott glass differs from sapphire, but it has never been exclusive to plastic.
In fact, it had always originally been added to hi index glass to reduce the chromatic aberrations related to high refractive indexes. It's only in more modern times that they've found other uses for it such as adding it to watch crystals.
The refractive index of the highest index glass is almost as high as that of sapphire, so that coating would probably do a decent job.
