Thread: [SOLD] PST double stack filter
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Old 19-07-2012, 12:12 AM
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Merlin66 (Ken)
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Merlin66 is offline 		 
Join Date: Oct 2005
Location: Junortoun Vic
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The SM40 filter shown is the old style pre Rich view tuning.
The attachment thread is a 77mm 0.75pitch same as a camera filter.
I've used these for double stacking on various Ha scopes with no major issues.