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Old 31-01-2009, 05:16 PM
Osangar (Wayne)
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Location: Mt Lawley, Perth, WA, Australia
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Solar filter for celestron 6se

I have been spending a bit of time admiring solar photos such as those from the Dutch open telescope and the like, and they all seem to use a H-Alpha filter

Can anybody suggest a good filter, that will fit my celestron 6 and is not to expensive.
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Old 31-01-2009, 06:12 PM
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lesbehrens (Les)
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i think the h alph filters form thousand oaks are cheep for your type of scope. http://www.thousandoaksoptical.com/halpha.html .
york optical can get them.
les
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Old 31-01-2009, 07:59 PM
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Merlin66 (Ken)
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These Ha filter units need an aperture stop to provide at least an f20 (or above) light cone to the filter. The resolution (bandwidth) of 1.2A approx is ideal for viewing prominences, but a little wide for detailed surface contrast.
A PST is cheaper.
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