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2017 Eclipse Blog / FAQ



What do I do with the glasses when the eclipse is over?


Great question!

 

The eclipse glasses contain a very special filter material that is ISO certified to be completely safe for direct solar viewing.  So, as long as that material remains undamaged, you could use the glasses to look safely at the Sun anytime you wanted to.  It’s not fantastically exciting to do that when there’s not an eclipse going on, though, unless:

(1) There are HUGE sunspots to be seen (this is pretty rare)

The sunspots have to be really big, because if they aren’t, then you won’t be able to see them on the surface of the Sun.

(2) There is a transit of Venus going on (and this won’t happen until 2117!)

If you didn’t see the transits of Venus on 2004 and 2012, sorry!

(3) There is a transit of Mercury going on, and you have REALLY good eyes (this does happen soon, on 11 Nov 2019)

Mercury does transit the Sun much more often than Venus, but it is very small against the Sun’s disk.  Most people cannot make it out just by looking with eclipse glasses.

You cannot see granulations on the Sun’s surface, or “solar flares” or prominences, with eclipse glasses.  To see those requires a filter that allows you to view the Sun in what’s called “Hydrogen-alpha” light – and those filters are expensive!


The eclipse glasses are really good for one thing – looking at the partial phases of a solar eclipse!  So we recommend taking good care of them while you’re using them for the 2017 eclipse, and then safely storing them for the next eclipse you happen to see!  They’ll be perfectly fine for years, so long as the filter material remains undamaged.

By doing this, not only will you be ready for the next eclipse, but you’ll be doing your part to help ensure that all these eclipse glasses don’t end up in landfills!  And that’s good for all of us!

Dan

2 Responses to “What do I do with the glasses when the eclipse is over?”

  1. John Freeman says:

    Can a pair of welding shades work?

    Is there a standard for auto window shade film that could be applied to a sheet of plaxiglass to be held up?

    Can the glasses be used with a spotting scope or binoculars?

    Can the glasses be used to view the event and record it on a cell phone?

    Thank you for doing this!

    • Admin says:

      Hi John –

      Welding glass will work if it is at least #14, and NOT the kind that is “instant on”. That doesn’t darken fast enough.
      There is no auto window shade film that is approved for direct solar viewing.
      Filters for spotting scopes and binoculars are made, that fit over these lenses and are the only approved devices.
      I have never tried to use the filter material with a cell phone. The manufacturer advises against it.

      Thanks!
      Dan

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