Thread: Deep Lagoon, Triffid in HA
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Old 19-10-2009, 07:44 AM
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supernova1965 (Warren)
Buddhist Astronomer

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Location: Phillip Island,VIC, Australia
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Quote:
Originally Posted by multiweb View Post
Hydrogen Alpha. A filter that let's in only a very narrow band of light around 650nm.
Thanks for the explanation. I love to learn new stuff
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