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Old Feb 24th 2009, 07:56 AM   #1
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Location: Esfahan, Iran
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Unhappy building H-alpha solar filter

Hi
I plan to build coronagraph and i want to use h- alpha filter for it but it is expensive then I try to build one.Therefor I need some information about it ????
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Old Feb 24th 2009, 09:51 PM   #2
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I don't know about coronagraphs, but as a Google user I find:the reference:
"A Coronagraph to View Solar Prominences", Scientific American, The Amateur Astronomer, pp. 99-103 (1955).
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