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Astro Blog
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Observing Transit of Mercury

5/7/2016

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Picture
SWAN's Solar Projector
The safest way to observe a transit is to project the image of the Sun through a telescope, binoculars, or pinhole onto a screen, but the event can be viewed with the naked eye using filters specifically designed for this purpose, such as an astronomical solar filter with a vacuum-deposited layer of chromium, eclipse viewing glasses, or Grade 14 welder's glass. An earlier method of using exposed black-and-white film as a filter is no longer regarded as safe, as small imperfections or gaps in the film may permit damaging UV rays to pass through. Also, processed color film (unlike black-and-white film) does not contain silver, and is transparent to infra-red. This may result in burns to the retina. Observing the Sun directly without filters can cause a temporary or permanent loss of visual function, as it can damage or destroy retinal cells.

Click the link bellow to see how to make a solar projector.
Making Safe Solar Projector
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  • Home
  • About
    • Achievements
    • Activities
  • Outreach
    • Past Events
    • Workshops
    • Academics
  • Gallery
    • Pictures
    • Videos
    • SWAN TV
  • Astro Blog
  • Astrophotography
  • Contact Us
    • Membership >
      • Information
      • Online Form
      • Terms of Membership