Oh that's another issue with sapphire: uncoated, it passes down to 195nm (UVC) with almost zero attenuation.
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Replying to @bofh453 @RichFelker
so you'd need to wear glasses under your glasses. I fail to see the problem with this. Imagine the memes
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Replying to @whitequark @bofh453
The way I look at that, wrt UV, my eyes are still no worse off than people who don't need glasses.
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You could do a coating though if it doesn't affect the optical properties badly.
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Replying to @RichFelker @whitequark
So the TiO2 thin film coating I put on my glasses b/c it annoys me when they fog up apparently blocks everything below UVA.
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Replying to @bofh453 @whitequark
A film that blocks everything below ~480nm would probably actually help a lot with chromatic aberration.
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Replying to @RichFelker @whitequark
Don't you mean ~415nm? 445nm for instance is what InGaN blue LEDs emit...
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Replying to @bofh453 @whitequark
No, I specifically mean getting rid of the awful blue-led light that spatially diverges so much from everything else. :-)
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The worst is in headlights. Every car with those f*%&ing things looks like a cop in rear-view.
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Replying to @RichFelker @whitequark
Oh, so notching that out is *desired*? Heh. (Also those aren't blue LEDs, but HID Xenon bulbs... the peak is around 475nm or so).
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I think I've seen LEDs too now, but yeah, the xenon ones definitely do it too.
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