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Solanum,
As Geoff indicated a Narrowband filter works best from dark skies as opposed to light polluted skies. If you already have good sky conditions you will get significant improvement on a lot of nebulous targets with a narrowband or UHC in your 10" dob.
The DGM NPB filter is a very narrow pass band, narrowband filter. It is almost a hybrid between a UHC and an OIII filter. I would recommend you consider this filter for use with your 10" dob.
CS-John B
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