Re:An Eclipse Chaser’s Guide to Your First Eclipse
by Florin_Andrei on Wednesday August 16, 2017 @04:14PM
(#15030933)
Those are #10 welding glasses, quite bright.
If you use #14 or even #13, there's no need to stack them with anything. They are sufficiently dark on their own. #14 are even ISO 12312-2 compliant for the purpose of eclipse viewing.
If you use #14 or even #13, there's no need to stack them with anything. They are sufficiently dark on their own. #14 are even ISO 12312-2 compliant for the purpose of eclipse viewing.
Here's the best information on related topics:
https://eclipse.aas.org/resources/solar-filters