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DGM NPB filter 2" Nebula Filter Astronomy For Sale


DGM NPB filter 2



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DGM NPB filter 2" Nebula Filter Astronomy:
$215

DGM NPB – NARROW PASS BAND NEBULA FILTER

An ultra high contrast type of filter that is very effective for small and fainter emission planetary nebula, as well as a variety of bright nebula.

The NPB filter is characterized by its narrow passband in the OIII and H-Beta emission lines as well as by its inclusion of a secondary H-Alpha passband. The H-Alpha passband allows for the perception of faint red colors in nebulas that have strong emission in the H-alpha line (e.g. M42 and M8), especially when observing with larger telescopes.


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