https://eclipse.gsfc.nasa.gov/SEhelp/safety.htmlOne of the most widely available filters for safe solar viewing is a number 14 welder's glass, available through welding supply outlets.
....cool that you picked up on that...I was totally about to comment, "welding mask" !!!.....
I was totally about to comment, "welding mask" !!!
You can also use an xray that's been previously processed.
yeah we'd just use old ones from the vet hospital I worked at. There's usually an edge around the processed image of most xrays we took. Good to know that it's not exactly "safe" tho. Whoopsies.... thankfully it wasn't a common occurrence. I don't need glasses/contacts so obviously good eye health is important if I wanna keep it that waySince most people would only have a processed x-ray with an image on it at home, the bolded above is not good advice. From the NASA page:
"Unsafe filters include color film, some non-silver black and white film, medical x-ray films with images on them, smoked glass, photographic neutral density filters and polarizing filters. Solar filters designed to thread into eyepieces which are often sold with inexpensive telescopes are also dangerous."
Viewing with Protection -- 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. The AAS Reputable Vendors of Solar Filters & Viewers page(link is external) doesn't list any suppliers of welder's filters, only suppliers of special-purpose filters made for viewing the Sun.To find out more about eyewear and handheld viewers go to https://eclipse.aas.org/eye-safety/eyewear-viewers(link is external).