ZWO S-II 7nm narrowband filter (36mm)

SKU: ZWO SII7nmD36 Categories: , ,

The ZWO Sulphur 2 (S-II) filter lets the light of the ionized sulfur pass and blocks the rest of the visual spectrum in which a CCD camera is sensitive.

Sulfur is not abundant in the universe, however, near high-energy regions and objects such as supernova shock fronts and hot massive stars. We typically see this Sulphur near areas where high-speed gases are colliding in gaseous remains of exploded stars — called supernova remnants, which tend to have relatively strong sulfur emission.

Key features:

  • Designed for nebula observation
  • Reduces transmission of certain wavelengths of light, eg Sky Glow.
  • High quality optically polished to ensure accurate 1/4 wavefront
  • more than 90% transmission at passband
  • Infrared wavelength 700nm – 1100nm cut-off
  • Precision off-band blocking
  • Multilayered anti reflection coating
  • Small spectral gap to minimize effect of light pollution
  • Parfocal – thickness  2mm


$239.00 inc GST

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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 Set for tricolor CCD astrophotography.

Narrowband imaging with the full set (H-alpha, OIII-CCD and SII-CCD) of filters can be done with the moon visible and in heavy light pollution, so your equipment is not sitting dormant for several weeks


Size: 36 mm
Shape: Round (unmounted)
Thickness: 2.0 mm
Package: Plastic case
Transmission at 672nm (S2) 90%
Infrared wavelength: 700 – 1100nm cut off
FWHM: 7±0.5nm
In the box: 36mm Sulphur 2 Filter