For the first time I saw on TV news channel,eclipse goggles, worn by people watching annular solar eclipse.What lens it is made of,seems to have mirror coating or reflective foil coating applied to it.What is it actually made of.
For the first time I saw on TV news channel,eclipse goggles, worn by people watching annular solar eclipse.What lens it is made of,seems to have mirror coating or reflective foil coating applied to it.What is it actually made of.
Just for the heck of it (I wanted to post) I did some Google research in response to Graduate's question (above).
Filters for safe viewing of a solar eclipse can be made of Shade Number 14 Welder's Glass, aluminized polyester (mylar) and/or "black polymer", which is a resin product with suspended particles of carbon. Anyone who is interested in direct solar observation, with or without a telesccope, should be well educated about the safety requirements before making any attempt. Here are some Web pages that I (as a layman and not any kind of Eye Care Professional) interpret as looking carefully researched and authoritative on the subject:
NASA TP 2001-209990: Eye Safety and Solar Eclipses
B. Ralph Chou, MSc, OD
Associate Professor, School of Optometry, University of Waterloo
Waterloo, Ontario, Canada N2L 3G1
http://umbra.nascom.nasa.gov/eclipse...ye-safety.html
"Observing Eclipses Safely" at MrEclipse.com
Copyright ©1999 by Mark Littmann, Ken Willcox and Fred Espenak
http://www.mreclipse.com/Totality/TotalityCh11.html
"Solar Eclipse Safety Page" at eclipseshades.com
Copyright © 2000 by Rainbow Symphony, Inc.
http://www.eclipseshades.com/safety.html
credit: Answers.com™If a direct method of viewing an eclipse is chosen (using proper safety equipment), a good rule of thumb to follow should be to limit the amount of time spent looking at the sun. It is best to not look at the sun for more than 20 seconds at a time, with at least a 30 second break between viewings. This will help reduce the possibility of eye damage that may exist even while using proper safety equipment.
http://www.answers.com/topic/solar-eclipse-2
Here are some materials that have tempted people from time to time: NONE of these materials are safe to use as eye protection for viewing a solar eclipse, sunspots, planetary transit of the sun or any other kind of solar observation:
- Photographic film negatives (fully exposed photographic film)
- Sunglasses, including "cross polarizing" sunglasses
- Metallic packaging from potato chip bags or other metallized food wrapping
- Compact discs (audio CD, computer CD-ROM and like products)
- Smoked glass
credit: VENUS2004.ORG "Safety Precautions to observe the transit of Venus"The Eclipse kind of glasses from the eclipse of 1999 must absolutely not be used to watch the transit. The material used to build these glasses can be damaged or too old. These eclipse glasses are very cheap, it is recommended to buy a new pair.
http://www.venus2004.org/sinformer/n...6.php?langue=2
Some Web pages with credible looking products for sale:
Eclipse Shades™
Safe Solar Eclipse Glasses, Viewers & Filters from Rainbow Symphony Inc.
http://www.eclipseshades.com/safety.html
"Solar Eclipse Glasses" from Astronomical Society of the Pacific
Constructed from double aluminized mylar and a scratch-resistant black polymer ...
http://www.astrosociety.org/cgi-loca...html?E+scstore
There is an array of products under the brand name "Thousand Oaks Optical", including solar filters for telescopes, binoculars and cameras and Black Polymer material for custom-building of handheld eclipse viewers.
Thousand Oaks Optical products at Hands on Optics online
Copyright 1997-2005 Hands on Optics
http://www.handsonoptics.com/slr_thousandoaks.html
Totality: The only kind of solar eclipse that can be observed safely with the naked eye is a TOTAL eclipse -- and only during the period of absolute totality, when the sun is entirely masked by the moon's shadow, and only the corona is visible.
credit: http://umbra.nascom.nasa.gov/eclipse...ye-safety.html
photo: Laupheim Public Observatory and Planetarium’s home page
rinselberg™ - good posts for your good times
http://www.optiboard.com/forums/show...3&postcount=16
Last edited by rinselberg; 10-04-2005 at 10:24 PM.
Rinselberg you are a great optiboard's info centre.Thank you:cheers:Originally Posted by rinselberg
I love these just for the heck of it posts!!!
Thank you !!! rinselberg
THANK YOU!!
11 days until The Great Solar Eclipse!
Anyone have any insight on making glasses for such an event?
I'm sure most on here have had that experience of forgetting a lens in the tint. You pull it out an hour later and go 'whoops! these welding glasses won't do' and start over. What I'm wondering is how protective the darkest possible tint is in comparison to solar glasses with the metallic film.
Thoughts? Experiences?
Have I told you today how much I hate poly?
Will be traveling north to try and get some good shots of the corona at least. But I have a feeling I may be left deflated (as my own photographic skills just aren't that great yet). We'll see I suppose.
For naked eye viewing, there are millions of places to get safe viewing glasses. The BIG thing everyone should be looking for is:
ISO 12312-2 certification, & CE stamps. These are minimums for solar filter safety in the US, and should be clearly printed on the glasses. It helps to purchase from reputable sources such as your local planetarium, science center, library, or optics shop (telescopes/cameras/etc).
Many places are giving them out for free. The most I've seen them sold for is a couple bucks. A pittance.
We are selling them at our office. They are selling like crazy! I am expecting to sell out today or tomorrow. I wasn't sure what the difference is between those and a good polar sun, so I checked out the ones we have and they are so dark you can't see your hand in front of your face. Looked at a bright light and it was very faint. Interesting stuff! Our office will be closing and we are all going out to see. Should be fun! Anyone that gets a good photo, with special filter, please post! Would love to see.
Pirates. Hang 'em!"It now appears that some companies are printing the ISO logo and certification label on fake eclipse glasses and handheld solar viewers made with materials that do not block enough [light]," AAS said.
http://money.cnn.com/2017/08/05/news...ses/index.html
Probably more damage from UV/photochemical than thermal.
https://www.scientificamerican.com/a...fry-your-eyes/"I have seen instances where the patient has eventually shown up with crescents burned into the back of the eye, and you can almost tell exactly when they looked."
You can extend your time under totality by flying at mach 2. External tanks recommended.
http://eclipse2017.org/blog/2016/11/...g-the-eclipse/
Damn clouds! Maybe some weather balloons attached to my lawn chair.
http://eclipsophile.com/wp-content/u...loud-10lvl.jpg
Science is a way of trying not to fool yourself. - Richard P. Feynman
Experience is the hardest teacher. She gives the test before the lesson.
I liked that CNN link. It mentions a welding 12-14 tint would be acceptable but that still doesn't tell me too much about how that compares to what a dye pot can do.
I also found a link at the bottom to be fairly informative.
https://www.space.com/36637-what-you...r-eclipse.html
I only get to see about 50-60% of totality way up here in New England, but I plan on picking up a couple solar shades for it.
Have I told you today how much I hate poly?
One thing to mention to any of your patients wanting to photograph the eclipse, is that unless you are on the direct path of totality, and then only DURING totality, is it safe to photograph the eclipse without filters. Camera sensors on expensive DSLR and mirrorless, as well as even your mobile phones can be damaged by exposure to the sun just as eye can. It happens much faster through telephoto lenses, or telescopes with a camera mount - but can damage sensors of any kind in rather short order.
Have I told you today how much I hate poly?
We have a little handout about eye safety that we give to people when they purchase the eclipse glasses. I have to wonder... how many people are we going to see as emergency patients after the eclipse? How many people won't listen and will just use their sunglasses? I had a lady today that kept asking me if her Rx suns will be safe. When I told her no, she kept saying, but even if they are Rx? Um... NO! I have been recommending that people try to put the eclipse glasses under their regular glasses so that they fit tighter and prevent the light from coming around the sides.
I was also wondering about the aftermath... hopefully our nation can smarten up for a day, but I won't hold my breath.
Have I told you today how much I hate poly?
I worry about liability exposure trying to help people be clever, who botch the attempt and do themselves harm.
For that reason, I advise patients who ask to do it like school kids: poke a hole in a piece of paper and watch the shadow. There's never a good reason to look directly at the sun, regardless of "eye protection."
Vuarnet lenses (according to their website) block 94% of infrared (which is where the damage comes from, to my understanding). Wouldn't advise anyone use them for viewing an eclipse, however. Personally, I'm hoping to build a shadowbox camera setup.
https://vuarnet.com/us/glass/the-vuarnet-standard
Pete Hanlin, ABOM
Vice President Professional Services
Essilor of America
http://linkedin.com/in/pete-hanlin-72a3a74
In reality this is a VERY good reason to look directly at the sun. These events are quite rare. And it is EXTREMELY rare to have one like this with a path of totality from coast to coast. IF you happen to be along the path of totality, and ONLY if you are along that path, you can safely look at the sun - ONLY during totality - without any eclipse glasses. Totality will last an average of just over 2 minutes at any given point.
Hopefully, people will be smart enough to understand that blinding light and searing pain aren't normal if they look at the sun directly without proper filters. I'm highly doubtful anyone would be able to carry a lawsuit to fruition due to their own stupidity. Unless you're giving out written notices that state it is medically safe to view the sun unprotected. Which of course - no one here is doing.
Pinholes are great. And any pinhole will work. Shoebox with a small bit of aluminum foil and a pin prick in it, and white paper on the opposite side...a strainer/colander from the kitchen, a straw hat, even the shadows and sun streaming through the leavs of trees will all produce little crescents on the ground. Most larger cities (and I expect a good number of smaller one as well) are likely to have either amateur or pro astronomers out with telescopes (properly filtered) to view in public spaces as well.
I found this list of reputable vendors of eclipse glasses. I ordered some, I think I will hand them out in the parking lot on August 21st.
https://eclipse.aas.org/resources/solar-filters
Link: Total Solar Eclipse Glasses 2017 Eyes Protection UV Infrared Filter Direct Sun
- From United States
- Customs services and international tracking provided
Yeaaaaahhhhhh...
Probably NOT smart to buy off ebay.
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