Astronomik SII 12nm CCD MaxFR 31mm Filter for Fast Systems Dovetail Clamp 5mm eye relief range allows

5mm eye relief range allows eyeglass wearers to enjoy the entire field of view without needing to remove their glasses

So the number of for example "H-alpha-photons" does not change significantly whether an H-alpha filter is installed or not

Svbony SV48P Telescope Sturdy Design

Durability: Due to our coating technique all Astronomik filters are highly scratch-resistant

2-Group Lens Structure

Astronomik SII 12nm CCD MaxFR 31mm Filter for Fast Systems Dovetail Clamp 5mm eye relief range allowsAstronomik SII 12nm CCD MaxFR 31mm MaxFR Astronomik photographic narrowband emissionline filters for fast optical systems. There is an ever growing demand for filters suitable for extremely fast optical systems like Celestrons 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 perfectly matched to the