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Astronomy and Cosmology
Astronomy and Astrophysics
Is there any material I can use for an aperture solar filter?
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[QUOTE="davenn, post: 6064713, member: 283516"] [B][COLOR=rgb(255, 0, 0)]NEVER EVER[/COLOR][/B] use an eyepiece filter for solar filtering not good advice 76mm is a good aperture size :smile: Easiest thing to use is 3 to 4 layers of a mylar survival blanket over the front of the scope Start with 4 layers, if it is too faint, reduce to 3 layers. I used film filters for 40+ years for viewing sunspots and solar eclipses when you get a bit more money (~US$50 - $170) you can get a commercial solar filter here's the same thing over the front of one of my telephoto lenses ….. [ATTACH=full]231412[/ATTACH] one of several suppliers [URL]http://thousandoaksoptical.com/shop/solar-filters/full-aperture-solarlite/[/URL]when you get lots of money, you can get a proper solar telescope like this one of mine …… [ATTACH=full]231415[/ATTACH] Now the mylar and the commercial filter glass ways are great for showing sunspots on the surface of the sun And a warning, because we are at solar minimum, there are very few spots to be seen. The sun is pretty lank most of the time. That solar scope of mine shows prominences on the limb and other features on the face of the sun. It is a very narrow Hydrogen Alpha (Ha) 0.7 Angstrom and less. with that you get images like this ……. [ATTACH=full]231417[/ATTACH] [ATTACH=full]231418[/ATTACH] [ATTACH=full]231419[/ATTACH] See my solar imaging thread on PF, here …… [URL]https://www.physicsforums.com/threads/solar-imaging-and-techniques.925656/[/URL]cheers Dave [/QUOTE]
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Is there any material I can use for an aperture solar filter?
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