Niels Noordhoek’s weblog

Using a solar filter that attenuates the suns light about 100,000 times, it is possible to safely watch the sun directly through a telescope.

This entry was posted on Monday, April 30th, 2007 at 2:50 pm and is filed under astronomy, ETX90. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.