Gentlemen,
I want to buy a plate of that ultra dark green glass that's used in arc welding helmets to view the sun (specifically the upcoming eclipse).
They come in various numbers... the higher the number, the darker.
Does anyone know what number filter I need to safely look at the sun (going for worst case... full noon sunlight on a clear day)?
I already have a #10 filter from a long time ago. It's pretty dark (I can barely see a 100 watt light bulb through it), but I'm guessing this isn't good enough for full blast sunlight.
Any suggestions or info will be appreciated! Thanks!
-- Roger
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