- FWHM：7 plus or minus 0.5nm
- Glass Thickness 1.9+/-0.03 mm
- Fine-optically polished to ensure accurate 1/4 wavefront over the both surfaces
- About 90% transmission at H-alpha line 656nm (H-Alpha filter )
- About 90% transmission at SII line 672nm (SII filter )
- About 90% transmission at major OIII line 500nm (OIII filter )
ZWO 36mm H-alpha SII OIII 7nm Filter Set
Narrowband filters will reduce the transmission of most wavelengths an only allow certain ones narrow bands to pass. The ZWO 36mm H-alpha SII OIII 7nm Filter Set allows only Hydrogen, Oxygen, and Sulfur emissions to be photographed. These filter will enhance contrast for these wavelengths and block most wavelengths produced by city lights.
- H-Alpha filter
- SII Filter
- OIII Filter
- Case x3
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