ZWO 31mm SII 7nm Unmounted Narrowband Filter

ZWO 31mm SII 7nm Unmounted Narrowband Filter


In stock - Shipped 1-2 working days.

Model:  zwo_sii_31-7nm
Part Number:  Z264-SII7nmD31
Brand:  ZWO


ZWO 31mm SII 7nm narrowband filter.

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 tri-colour CCD astrophotography.


  • FWHM:7±0.5nm
  • Thickness 1.9+/-0.03 mm  (1.25”/31mm/36mm)
  • Fine-optically polished to ensure accurate 1/4 wavefront  over the both surfaces
  • 80% transmission at SII line 672nm (SII filter)

Transmission Curve

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