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Thread: Hydrogen Alpha filter

  1. #1
    Join Date
    Apr 2002
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    Hydrogen Alpha filter

    2007 Discovery 3 SE7 TDV6 2.7
    2012 SZ Territory TX 2.7 TDCi

    "Make the lie big, make it simple, keep saying it, and eventually they will believe it." -- a warning from Adolf Hitler
    "If you don't have a sense of humour, you probably don't have any sense at all!" -- a wise observation by someone else
    'If everyone colludes in believing that war is the norm, nobody will recognize the imperative of peace." -- Anne Deveson
    “What you leave behind is not what is engraved in stone monuments, but what is woven into the lives of others.” - Pericles
    "We can ignore reality, but we cannot ignore the consequences of ignoring reality.” – Ayn Rand
    "The happiness of your life depends upon the quality of your thoughts." Marcus Aurelius

  2. #2
    Join Date
    Jan 1970
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    Goolwa SA - but top ender forever
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    so what the hell is this filter???

    Oh and where do you get it? I've never heard of it before

  3. #3
    Join Date
    Nov 2009
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    It's an filter used (usually on telescopes) to get a "real" picture of the surface detail of the sun, it is a narrow band filter in the 650 nanometre range.
    Around the $200 - $300 range depending on size, most good astronomy shops have 'em.
    cheers

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