This 2 Baader H-alpha 20nm Bandpass Filter from Alpine Astronomical is a high-contrast deep-sky H-alpha/red filter for RGB astroimaging with CCD and CMOS cameras and telescopes of all focal ratios. The filter allows high-contrast images of H-II...
This 2 Baader H-alpha 20nm Bandpass Filter from Alpine Astronomical is a high-contrast deep-sky H-alpha/red filter for RGB astroimaging with CCD and CMOS cameras and telescopes of all focal ratios. The filter allows high-contrast images of H-II...