DGM NPB filter 2" Nebula Filter Astronomy For Sale
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DGM NPB filter 2" Nebula Filter Astronomy:
DGM NPB – NARROW
PASS BAND NEBULA FILTER
high contrast type of filter that is very effective for small and fainter
emission planetary nebula, as well as a variety of bright nebula.
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.