Thread: [SOLD] DGM NPB filter 2"
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Old 04-02-2020, 04:55 PM
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MortonH
Deprived of starlight

MortonH is offline 		 
Join Date: Nov 2006
Location: Sydney
Posts: 3,912
NPB = narrow pass band (similar to UHC or ultra high contrast).

Brand is DGM.

A Google search will give you lots of information on how good they are.