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Astrodon 3 nm H-Alpha Narrowband Filter - 49.7 mm Round Unmounted - HA3-50R
About Astrodon Narrowband Filters
Astrodon filters are high performing, durable filters that provide significant aid for astrophotography and research pursuits. Each filter is constructed using a highly innovative process with a single high quality 3 mm thick fused silica substrate and full hard oxide sputtered coatings. With these Astrodon Narrowband filters, imagers can count on consistently high performance, as well as a more narrow spectrum compared to most other filters for superb contrast and the ability to view the faintest nebula detail. Astrodon guarantees >90%T performance at the emission line.
Astrodon 3 nm Narrowband Filter Highlights
- Guaranteed 90%+ maximum transmission for the highest achievable performance
- 3 nm bandwidth
- 49.7 mm unthreaded
- >OD 4 (0.01% transmission) out-of-band blocking
- Clear 1/4 wave substrates feature hard-oxide coatings to the edge, removing light leakage from uncoated rims
- Edge blackened to reduce reflections
- Parfocal with all other filters made by Astrodon
Astrodon 3 nm H-Alpha Narrowband Filters
Hydrogen-alpha filters are highly favored when it comes to narrowband filters. The hydrogen-alpha filters for 656.3 nm are deep red in color. As it is the most common element in the universe, hydrogen is present in emission nebula such as the North American and the Pelican, planetary nebula such as the Dumbbell and Ring, Wolf-Rayet objects like Cresecent and Thor's Helmet, even supernova remnants like the Veil nebula.
While many imagers are content to display a simple black and white h-alpha image of an object, most imagers will want to combine their h-alpha data with their red RGB data in order to augment structural detail while preserving a "natural" appearance. For this reason, h-alpha filters make a perfect initial narrowband extension of your LRGB filters.