Quantum Hydrogen Alpha 0.4Å SE

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0.4Å SE Quantum Solar Filter, Hydrogen Alpha line. For use with refractors, SCTs, Maksutovs. Includes front and rear plates, power supply, instructions, and hard case. Requires ERF or UV/IR cut filter, plus Powermate barlow or stop down mask to reach F/27-F/35 focal ratio for best performance (sold separately).