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Solar-Eclipse Glasses On Amazon May Not Meet NASA's Safety Requirements (qz.com)
For those planning to watch the solar eclipse on August 21st, you're going to want to make sure you have some specialized, ultra-dark glasses to see safely, especially if you're not in the "path of totality." If you're on the hunt for said glasses, please be on the lookout to make sure you buy glasses that meet NASA's safety standards. Quartz is reporting that there are many "fly-by-night manufacturers looking to turn a quick profit by selling subpar and potentially dangerous goods to unsuspecting Americans." From the report: The first stop for most seeking a pair of eclipse glasses is likely to be Amazon, where there are literally thousands of listings for the devices, ranging in materials from cardboard to bronze. I, too, went on Amazon to scout out a pair. I picked more or less at random: I chose a cheap pack of 10 cardboard glasses with five different designs, at least two of which were not garishly jingoistic. About a week after I bought them, I had a thought: Maybe I should double-check to make sure they met safety standards set by the scientific community. Next stop: NASA. NASA, of course, has a website dedicated to the 2017 eclipse, and on it, they have a section dedicated to eclipse-viewing safety. The site says that eclipse-viewing glasses must meet a few basic criteria: Have ISO 12312-2 certification (that is, having been certified as passing a particular set of tests set forth by the International Organization of Standardization); Have the manufacturer's name and address printed somewhere on the product; Not be older than three years, or have scratched or wrinkled lenses.
look, you could buy a pre certified glass, put it on some cardboard and not meet the requirements. it might pass the safety requirements though as a device, if it was put into them, but the short blurb makes it like they wouldn't.
besides than that what you will find is ISO 12312-2 "compliant".
oh the days of just using smoked glass.
the device might pass the safety checks - it just doesnt have the paperwork... that doesnt mean that it will make you blind.
world was created 5 seconds before this post as it is.
According to Revlon, it's mauve. Seems like a poor choice; it's not even after labor day.
The opinions stated herein do not necessarily represent those of anybody at all. Deal with it.
You only have one set of eyes, don't be foolish about this.
Chances are that non-certified stuff has deficiencies in UV/IR filtering, so while you may be able to look into the sun for much longer than usual, your eyes still may get an unhealthy dose of radiation. No protection at all will at least have you turn away in time (unless you're foolish enough to look at the sun through an unprotected telescope, binoculars or tele lens).
As an amateur astronomer, I use Baader visual solar filter film, adapted to my different scopes and lenses. An A4 sheet (you could make a load of sunglasses from this) comes at 25EUR, which is very cheap compared to other options for observing the sun. Most of all, it's safe!
I do the same thing; it's designed to protect against the exact same thing (light emitted by a hot plasma, containing blinding amounts of UV and excessive visible and IR). The main downside is it makes you look like a weirdo when you're standing around in public looking at the sun with a welding helmet on ;)
I guess if you want to go hardcore, you could have the welder with you and act like you're trying to weld the sun. Then people will stop seeing you as a weirdo and just think that you're high instead. ;)
So, apart from that, how was the play, Mrs. Lincoln?
Do not do either of these.
A floppy disk has only marginal IR protection, and blurs the image heavily.
Soot works if you deposit it at the right thickness, but it's easy to get the thickness wrong, and the slightest smudge can eliminate your protection; the coating is very fragile.
A common third trick is looking through CDs. Which can work, if you pick the right one, but their transparency varies dramatically, so there's no guarantee that an arbitrary one will offer sufficient protection. If you're willing to risk your eyes with an improvised filter, a CD should be good if you can barely see an incandescent bulb through it.
Photography filters and photographic film should never be used for looking at the sun. They don't block nearly enough IR.
More info about various homemade and professional filters tested here.
So, apart from that, how was the play, Mrs. Lincoln?
Yes a piece of welding glass works great but make sure you use at least a #14 glass per NASA recommendations. This is widely available through welding supply companies. Not all welding eye protection is adequate for looking at the Sun.
Just use the spare glass instead of the full mask
It's the kids whose parents are careless that I fear for. Any adult who purchases safety gear for something this vital from sunny_eyeseller69 on amazon/eBay or from a roadside vendor kinda has it coming.
I'd give the ones buying offline slightly more sympathy. The first group are proven to have Internet access.
kartune85 : Incapable of reason, observation or learning. A kind of dim, drab, flightless parrot.
And for anyone using telescopes, binoculars or slr cameras...
Set a loud damn alarm for ten seconds before the end of totality, and do not leave unfiltered devices on tripods pointed at the sun. At best you'll wreck your camera. At worst some idiot kids (or adult) will try to sneak a peek.
I've seen the eyepiece cover of a Celestron kids telescope melt fully into the eyepiece itself on a scope left mounted after totality in China 2009.
kartune85 : Incapable of reason, observation or learning. A kind of dim, drab, flightless parrot.
Maybe it's maybelline you insensitive clod.
Welding glass filters may work - but one needs to get the right shade. "Only goggles made for electric arc welding can be used to observe the sun, and they must have a shade scale number of 12 or higher. Shade 13 is ideal for solar viewing, but that shade is typically not sold in stores, Fienberg added."
NASA recommends #14 welding glass.
I bought a pack of glasses off Amazon. Not the cheapest ones, I figured the plastic-framed ones would be less likely to be fakes than the cardboard ones, and of course I made sure it at least claims to be ISO 12312-2 tested and compliant. But it was still a somewhat shady dealer, and anyone can print the words "ISO 12312-2" on the packaging.
I would think there would be a site to check that something claiming ISO certification actually was tested against it, but I've not been able to find one. Does anyone know of a way to confirm?
The SAFEST way to view the eclipse is INDIRECTLY, not looking directly at the sun.
Instructions:
https://eclipse2017.nasa.gov/s...
https://www.timeanddate.com/ec...
4 bucks at Northern tool for just the glass, 4 bucks for welding goggles at Harbor Freight or 5 bucks for a flimsy paper pair of glasses. Going with the welding goggles.
And can re-use them later as a Steampunk Costume Prop. . .