ZWO 1.25" Duo-Band filter. Clean. $50.

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ZWO 1.25" mounted Duo-Band filter for OSC cameras. Clean. $50.

Passes light at both H-Alpha (656 nm) and OIII (500 nm) wavelengths and rejects heavy light pollution lines.

-H-Alpha Bandwidth: 15 nm @ > 80% transmission at Ha line 656.3 nm

-OIII Bandwidth: 35 nm @ > 90% transmission at major OIII line 486 nm, 496 nm, and 501 nm