Thread: Seagull Nebula and Thor's Helmet
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Old 31-12-2010, 02:05 PM
tornado33
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Join Date: Jan 2005
Location: Newcastle, NSW, Australia
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Great image there. A good idia using the filter external to the lens, which is an interference type filter, whose passband changes with fast F ratios. Also, only filtered light can now enter the lens.
Scott
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