Filtersets H-Alpha, OIII & SII

IDAS narrowband filter set for astrophotography - high contrast - also for fast telescopes - up to 70% transmission at f/2

• H-Alpha 6.8nm, O-III 6.0nm and S-II 6.3 nm half width
• 2" mounted standard filter thread
• Low profile filter mount - height only 6 mm
• Reflection minimizing coating
• no halo problem due to anti-reflective layer
• Half-widths for wide range of applications
• Can also be used on extremely fast telescopes
• Made in Japan