The Chroma H-Alpha 3nm Filter is essential for ultra high contrast images of nebulae under high levels of light pollution and Moon light. Normally used in comjunction with Chroma 3nm OIII and 3nm SII narrowband filters to create composite images.
At 656.3nm, a narrow-band emission filter is required to separate H-Alpha from the SII doublet (671.6nm and 673.1nm).
Wavelength (CWL): 656
Bandwidth (FWHM): 3
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