Thread: Ha fillters?
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Old 24-04-2013, 04:19 PM
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Merlin66 (Ken)
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Merlin66 is offline 		 
Join Date: Oct 2005
Location: Junortoun Vic
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Ha emissions are only 0.3nm bandwidth..
All the Ha filters do is allow more (or less) background light to get through. With a very narrow bandwidth filter <6nm you can have issues with very fast f ratios.
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