Don't look directly at the sun or partially eclipsed sun through an unfiltered camera, telescope, binoculars or other device. Similarly, don't look at the sun through a camera, telescope, binoculars or any other optical device — even while wearing eclipse glasses. The concentrated solar rays passing through the lens es of the optical device could damage the filter of the eclipse glasses and enter your eyes, causing serious injury.
Seek expert advice from an astronomer before using a solar filter with a camera, telescope, binoculars or any other device. Note that solar filters must be attached to the front of any telescope binoculars, camera lens or other optics.
If you're unable to purchase ISO-certified eclipse glasses prior to a solar eclipse, using a technique called "pinhole projection" is another way you can view it safely. How do you create a pinhole projection system for safe viewing of a solar eclipse? According to the Exploratorium in San Francisco, you'll need a box that's at least 6 feet long, aluminum foil, duct tape, a pin and a sheet of white paper.
The whole process involves a lot of work cutting a 1-inch hole in the center of the box, taping a piece of foil over the hole and poking a small hole in the foil with a pin, for starters. Though this solar-eclipse viewing method is less dramatic than watching directly through eclipse glasses, pinhole projection will protect your eyes from damage. To perform this technique, cross the outstretched, slightly open fingers of one hand over the outstretched, slightly open fingers of the other, creating a grid or waffle pattern.
Read and follow any instructions printed on or packaged with the filter. Always supervise children using solar filters. If you normally wear eyeglasses, keep them on. Put your eclipse glasses on over them, or hold your handheld viewer in front of them.
Stand still and cover your eyes with your eclipse glasses or solar viewer before looking up at the bright Sun. No matter if you're at the beach or waiting anxiously with your head toward the sky to catch the eclipse, it's always dangerous to stare directly into the sunlight. And yes, that includes staring at the sun in your brand new polarized Ray-Bans. According to NASA, the only safe way to view a solar eclipse is by using approved solar eclipse glasses.
And, yup, like all good things, this one is already ruined too, as Amazon reported a huge recall on counterfeit solar eclipse glasses that actually provide no protection at all. According to NASA, approved solar eclipse safety glasses must come with official listed certification, noting that the glasses are ISO compliant with safety regulations. These glasses look extremely similar to the 3D glasses you wear at the movie theater, without the red and blue lenses.
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