Thread: Do I need an Oiii filter?
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  #5  
Old 21-12-2011, 09:42 PM
Forgey (Paula)
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Forgey is offline 		 
Join Date: Jul 2011
Location: Thurgoona, NSW
Posts: 922
Just reading thought this thread and then did a google search and came across this article http://www.astrobuysell.com/paul/filters.htm
Might be useful to some.
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