ZWO 1.25" Ha SII OIII 7nm Narrowband Filter Set

ZWO 1.25'' Ha SII OIII 7nm Narrowband Filter Set


In stock - Shipped 1-2 working days.

Model:  zwo_hso7_125
Part Number:  ZWO-HSO7-1.25SET
Brand:  ZWO


ZWO 1.25" Ha, SII and OIII 7nm narrowband filter set.

This new Narrowband filter set from ZWO includes H-Alpha, Oxygen III, and Sulfur-II filters for high contrast deep sky images. 


  • 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 H-alpha line 656nm (H-Alpha filter)
  • 80% transmission at SII line 672nm (SII filter)
  • 80% transmission at major OIII line 500nm (OIII filter)

H-Alpha Filter

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!

SII 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.

OIII Filter

The ZWO narrowband O-III 7nm filter is designed for nebula observation allowing 7nm bandwidth of light centred 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 favourite nebulas in a totally new light, no matter how polluted your skies may be!

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