[QUOTE=Viliam Furik;580568]I watched it too, with homemade eclipse glasses,[/QUOTE]This is how people damage their vision. :gah:
:failed:

[QUOTE=Uncwilly;580577]This is how people damage their vision. :gah:
:failed:[/QUOTE]
Open air carbon arcs are pretty effective at close range too. (center electrodes from 2 dead zinc dry cells, on a 110v AC power cord; do not try this at home or elsewhere, alone, or without proper ventilation and protective gear. Or at all.)

[QUOTE=Uncwilly;580577]This is how people damage their vision.[/QUOTE]

LOL... I was wondering who was going to bat that ball first! :smile:

Hand-held pin-hole cameras are taught in elementary school.

And yet a certain POTUS looked at an eclipse without any eye protection recently (fortunately it was cloudy at the time; the US.SS security detail didn't fully understand the risk profile)...

[QUOTE=Uncwilly;580577]This is how people damage their vision.[/QUOTE]

In my defense, they are very efficient. The sunlight going through was dimmer than my monitor's light, and I have measured the UV-B light coming through to be about 0% (our school physics teacher has a device for measuring UV-B radiation.). Measurement was done using real sunlight on a two-layer version in March, I think, so three layers should be plenty for June. They seem to only let through a bit of red-to-yellow mix because the sun looked orange through them.

[QUOTE=Viliam Furik;580586]I have measured the UV-B light coming through to be about 0% (our school physics teacher has a device for measuring UV-B radiation.)[/QUOTE]
0% of what? Don't you know that 0% (0.4% rounded) of the radiation inside the containment at Chernobyl is still bad for you? For reference the Sun's apparent magnitude is −26.7, that of the full Moon is about −11, and that of the bright star Sirius, −1.5. And that is a log scale. -23 will still hurt you.
And the UV-A, C, and IR values? The IR is just one part that will get you.

Nice shots from Pittsburgh on [URL="https://twitter.com/DaveDiCello/status/1402946939864469507"]twitter.[/URL]

[QUOTE=Uncwilly;580589]0% of what?

And the UV-A, C, and IR values? The IR is just one part that will get you.[/QUOTE]

About 0% of sunlight's UV-B, as I mentioned. For other UVs, I don't think the amount is much different. About IR, I don't think it can stop it, but neither can many things. For exposure as short as taking a look at an eclipse, I think even if I looked directly I would be ok after few minutes of seeing one big blur.

1/4000 f/36 through cloud, after a short drive to get a bit south of Cambridge where the cloud cover was less complete:

[url]https://www.chiark.greenend.org.uk/~twomack/eclipse.jpg[/url]

[QUOTE=fivemack;580600]1/4000 f/36 through cloud, after a short drive to get a bit south of Cambridge where the cloud cover was less complete:[/QUOTE]
A great shot!

Courtesy of Astronomy Picture of the Day

[URL="https://apod.nasa.gov/apod/archivepix.html"]https://apod.nasa.gov/apod/archivepix.html[/URL]

Enjoy