From our viewing site, the sky is semi dark to dark and we find that our filters still make a great deal of difference bringing out much more nebulosity than without them.
We have an Astronomik UHC 1.25" & DGM NPB 2" & 1.25".
Although they are mainly used in our 12" Dob, the 1.25" perform very well in the Meade ETX125PE ( 5" ).
Must admit the NPB is used more than the UHC in both scopes as it provides far better views.
David
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