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H-alpha STL narrowband filter (50.8mm)
Size (wavelength 656nm), unmounted for SBIG filter wheels
An excellent high-contrast re deep sky filter for RGB applications, optimized for all full-frame CCD-chips. Allows high-contrast CCD footage of HII regions (E.g., North America Nebula) from 'light-polluted' environments.
An excellent high-contrast, red deep sky filter for RGB applications, optimized for all full-frame CCD chips. Allows high-contrast CCD exposures of H-II regions (e.g. the North America Nebula) from 'light-polluted' locations.
