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Old 08-21-2017, 04:45 PM
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slimshady2357 slimshady2357 is offline
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Join Date: Jul 2004
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Default Re: The Make Something Every Week Contest

This article would appear to confirm what thedoc said:
Quote:
Experts suggests that one widely available filter for safe solar viewing is welders glass of sufficiently high number. The only ones that are safe for direct viewing of the Sun with your eyes are those of Shade 12 or higher. These are much darker than the filters used for most kinds of welding. If you have an old welder’s helmet around the house and are thinking of using it to view the Sun, make sure you know the filter’s shade number. If it’s less than 12 (and it probably is), don’t even think about using it to look at the Sun. Many people find the Sun too bright even in a Shade 12 filter, and some find the Sun too dim in a Shade 14 filter — but Shade 13 filters are uncommon and can be hard to find.
We don't want a blind Bort!

Edit: https://www.usatoday.com/story/news/...ely/578679001/

Nasa says only 14 or higher!
Quote:
According to the NASA total eclipse website, a shade 14 welding lens is the only lens adequate for viewing the eclipse.
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BrotherMan (08-21-2017)
 
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