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I can for one vouch for DGM Optics NPB (narrow pass band) filter. I got contrastier views of nebulae with this that my old Lumicon UHC (which I subsequently sold to someone else). Don't get me wrong the Lumicon was a great filter, but the DGM was just a tad contrastier! And their semi broadband (leans closer to narrowband) VHT (very high throughput) is also very very good.
Darren
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