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hydrogen (H-alpha) and sulfur (SII) you may select your filters either with 12nm or 6nm Bandwidth (FWHM)
Brightness can be adjusted to match observing conditions
H-alpha is perfect for capturing the red glow of nebulae
the distance will be shortened indoors by obstacles
long & ugly queues
Astronomik SII 12nm CCD MaxFR 2'' (M48) Filter for Fast Optical Systems refractor telescope diagonal hydrogen (H-alpha) and sulfur (SII)Astronomik SII 12nm CCD MaxFR 2'' (M48) MaxFR Astronomik photographic narrowband emissionline filters for fast optical systems. There is an ever growing demand for filters suitable for extremly fast optical systems like Celestron's RASA and the Epsilon Astrographs made by Takahashi. Our novel MaxFR emission line filters are suitable up to very fast focal ratios. The new Astronomik MaxFR series of narrowband emissionline filters is perfect matched to
