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H-alpha filter passes light at 656nm wavelength. Best choice of narrowband H-alpha astrophotography filter for high-contrast imaging and revealing rich details of the nebula even in areas with strong light pollution,
OIII Filter: The narrowband O-III 3nm filter is designed for nebula observation allowing 3nm bandwidth of light centered on a wavelength of 500nm through, which corresponds to OIII emission lines, blocking out all other light.
Excellent suppression of disturbing halos: A common problem with filters is the appearance of halos around bright stars. These disturb the appearance of an otherwise good photo considerably.
During the development of the Anti-Halo-PRO filter, special attention was therefore paid to preventing the appearance of halos.
