ZWO Narrowband Filter Set - 7nm H-alpha, OIII & SII

ZWO H-Alpha Filter - 7nm

The ZWO H-Alpha filter has a bandpass of 7nm and passes light at 656nm wavelength, light transmission rate comes up to 80%. Best choice of narrowband H-alpha astrophotography filter for high-contrast imaging and revealing rich details of the nebula even in areas with strong light pollution, just prepare to experience the infinite fun with it!

ZWO OIII Filter - 7nm

The ZWO narrowband O-III 7nm filter is designed for nebula observation allowing the 7nm bandwidth of light centered on a wavelength of 500nm through, which corresponds to OIII emission lines, blocking out all other light. Adding the ZWO O-III Narrowband filter to your imaging collection will help you go beyond the RGB imaging and will help capture your favorite nebulas in a totally new light, no matter how polluted your skies may be!

ZWO SII Filter - 7nm

The ZWO narrowband S-II 7nm filter passes light at 672nm wavelength with a bandpass of 7nm which is designed for nebula observation. It is suitable for visual observation on most emission nebulae, planetary nebulae and supernova remnants, use it with H-alpha and OIII narrowband filters (SHO Set) for tricolor CCD astrophotography.

Technical Data

• FWHM：7±0.5nm
• Glass Thickness 2.0+/-0.03 mm (1.25”/31mm/36mm)
• 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 )
• Infrared wavelength 700-1100nm cut-off
• <0.1% transmission of off-band, OD3(Optical Density)

Why Choose the ZWO Narrowband Filter Set - 7nm H-alpha, OIII & SII ?

• High-quality glass and precise manufacturing ensure accurate bandpass and high transmission rates.
• Designed for optimal performance in challenging light pollution conditions.
• Compatible with a wide range of telescopes and imaging systems.
• Enhances the visibility and detail of celestial objects in astrophotography.
• Ideal for capturing rare and elusive nebulae in stunning clarity.