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ikenbot:

Astrophotographic Narrowband Filters: What Are They?

Like Ha (Hydrogen Alpha) filters, NB filters help astronomers view the sky through digital enhancements that aim to help us view the sky in rich details and chemical composition.

Images: 1- IC1396 2- NGC2237 in NB filters 3- IC2948

Narrowband (NB) filters enhance contrast of emission objects by accepting only a narrow range of wavelengths around the emission lines of hydrogen (H-a, 656 nm), oxygen (OIII, 501 nm), sulfur (SII, 672nm) and others.

They can be used to image when the moon is up, thereby extending imaging time. They can be used in light-polluted locations.

828 Revolutions / 7 months ago
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