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> OT: Venus Transit, is a welding helmet safe?
zymurgist
post Jun 5 2012, 03:26 PM
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Specifically, is an electronic welding helmet safe to look at the sun?
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Katmanken
post Jun 5 2012, 03:51 PM
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Short answer, I wouldn't try it.

Take a cardboard box, put a pinhole in it (aka pinhole camera), and aim the hole at the sun. Put a sheet of white paper below the hole so that the sunlight beam coming through the hole shines on the paper. Move the the sheet of paper farther away from or closer to the hole to set the image size. Enjoy the view. No danger in doing that.
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Jeffs9146
post Jun 5 2012, 03:57 PM
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I have always used 3-4 layers of exposed film taped to the end of a small set of binoculars! The welding helmet was not dark enough (at least mine) to completly cut through the glare and you would not be able to see the dot of Venus!
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Rand
post Jun 5 2012, 03:59 PM
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Lenses are rated. If I recall, 12 is safe. But that's full solar. If it seems bright, then don't. Pretty simple really.

If you look, then look away, then see remnants.... You are DOOMED. Doomed I say.
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Rand
post Jun 5 2012, 04:01 PM
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After the recent full on eclipse, you might as well watch this one with a pinhole shoebox. Meh.
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zymurgist
post Jun 5 2012, 04:07 PM
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No eclipse for east coasters.

When we are lucky enough to get one, it's usually cloudy.
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r3dplanet
post Jun 5 2012, 04:42 PM
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Twelve is still a little unsafe. You can use #14 welding goggles (rare) or buy solar-certified specs prior. The exposed film trick works also. I'm looking at it now with both #14 goggles and solar-certified specs and even the #14s are hurting a little.
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Steve
post Jun 5 2012, 04:52 PM
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My kids bought cheap special cardboad framed glasses from amazon. Work great. We are watching the eclipse now.
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'73-914kid
post Jun 5 2012, 04:52 PM
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Most dedicated welding stores sell #14 masks if you can find a store nearby. The problem is, most are still out of stock from the recent solar eclipse.. #14 are fine for the quick glance at the sun I'd say.
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SLITS
post Jun 5 2012, 05:13 PM
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I used my Harbor Freight Shield ... worked great. Shiny disk, black dot. I am not going to stand there and watch all 6 hours / 40 mins of transit time.

Now that the thrill is over I guess I'll go back to my totally dull life.

Oh, the auto-darkening welding helmet didn't get dark enough.
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mrbubblehead
post Jun 5 2012, 05:17 PM
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mine wouldnt turn on. i had to use my old school regular lens.... its pretty cool to see another planet.
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SirAndy
post Jun 5 2012, 05:26 PM
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QUOTE(Katmanken @ Jun 5 2012, 02:51 PM) *
Take a cardboard box, put a pinhole in it (aka pinhole camera), and aim the hole at the sun. Put a sheet of white paper below the hole so that the sunlight beam coming through the hole shines on the paper. Move the the sheet of paper farther away from or closer to the hole to set the image size. Enjoy the view. No danger in doing that.

Did just that, you can even see some sunspots!

(IMG:style_emoticons/default/cheer.gif)

Attached Image
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SirAndy
post Jun 5 2012, 05:29 PM
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Adjusted for the weird camera angle ...



Attached image(s)
Attached Image
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SLITS
post Jun 5 2012, 05:30 PM
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And if you are lazy like me, use this link:

See Venus Transit the Sun

and use the University of New Mexico feed ............
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andys
post Jun 6 2012, 09:50 AM
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QUOTE(mrbubblehead @ Jun 5 2012, 04:17 PM) *

mine wouldnt turn on. i had to use my old school regular lens.... its pretty cool to see another planet.


+1 My auto-darkening one didn't work. Old school yes.

Andys
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76-914
post Jun 6 2012, 12:09 PM
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I watched the last eclipse thru a Lay's Chip bag (mylar). A party balloon (the silver foil type, also Mylar) works, also.
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ChrisFoley
post Jun 6 2012, 01:16 PM
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QUOTE(zymurgist @ Jun 5 2012, 04:26 PM) *

Specifically, is an electronic welding helmet safe to look at the sun?

Simple answer - yes. Auto darkening helmets provide full UV protection even in the light state.
The only problem if the lens isn't dark enough or doesn't switch to the dark state, is your eyes will get tired of the brightness quickly. There are no lasting negative effects.
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Rand
post Jun 6 2012, 04:05 PM
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Woah. Depends on the darkening level. My "electronic welding helmet" rocks, but....
You have to adjust the darkening level with a knob. And even at full dark, some critics will still give you grief. Mine was fine.

Like I said before, can you look at it without it seeming too bright, then look away with no artifacts??
There's no substitute for common sense.

Thought I'd share this for fun....

http://gizmodo.com/5916350/this-amazing-sp...dium=socialflow
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zymurgist
post Jun 6 2012, 05:41 PM
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It was cloudy here. (IMG:style_emoticons/default/sad.gif)
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ChrisFoley
post Jun 6 2012, 06:07 PM
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QUOTE(Rand @ Jun 6 2012, 05:05 PM) *

Woah. Depends on the darkening level. My "electronic welding helmet" rocks, but....

I used to have an auto darkening lens that was real touchy. It would switch if there was an incandescent bulb nearby. And I know it switched when aimed at the sun. I guess I don't have that lens anymore though.
All arc welding lenses provide 100% protection from UV, including auto darkening lenses regardless of their darkness level. An electric arc is obviously brighter than the sun if the sun won't even make an a/d lens switch to dark.
Just for hahas, today I tried looking at the sun with my auto darkening helmet.
It wouldn't switch to dark state so I couldn't really look at the sun directly.
But I did anyway... it was too bright...I had to look away after only a few seconds. There was a distinct, but not too bright, afterglow in my eyes for a few seconds but there were no lasting effects.
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