ZWO 1.25-inch H-alpha SII OIII 7nm Filter Set

The ZWO 1.25-inch H alpha, Sii, Oiii, 7nm Filter Set will reduce the transmission of most wavelengths and only allow certain narrow bands to pass. 

Technical Specifications of the ZWO 1.25-inch Filter Set

• FWHM: 7 plus or minus 0.5nm.
• Glass Thickness 1.9+/-0.03mm (1.25 inches/ 31mm/ 36mm).
• Fine-optically polished to ensure accurate 1/4 wavefront over 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).

• The ZWO 1.25-inch H-alpha Sii Oiii 7nm Filter Set allows only ionized Hydrogen, Oxygen, and Sulfur emissions to be photographed.
• These filter will enhance contrast for these elements wavelengths and block most wavelengths produced by city lights.
• Glass thickness: 1.25 inches.

• H-Alpha filter.
• Sii Filter.
• Oiii Filter.
• Case.