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Old 19-10-2008, 05:09 PM
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Merlin66 (Ken)
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Merlin66 is offline
 
Join Date: Oct 2005
Location: Junortoun Vic
Posts: 8,904
http://www.telescopes.com/telescope-...dfilter7nm.cfm
http://www.opticsplanet.net/celestro...3-filters.html
http://www.optcorp.com/ProductList.a...05-156-840-852

Christian Buil has done a lot of investigation on the subject.
http://astrosurf.com/buil/filters/curves.htm
http://astrosurf.com/buil/350d/350d.htm
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