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

ZWO 1.25" Ha SII OIII 7nm Narrowband Filter Set

Now: £332.00 (Save:  £37.00) Was:  £369.00
  (1 Review)
✓ 2 year warranty


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About this product

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

New & Improved with higher light transmission and less reflection (reduced halos around bright stars). 

Ha 7nm

Has a bandwidth of 7nm and passes light at 656nm wavelength. 

OIII 7nm

Has a bandwidth of 7nm and passes light at 500nm wavelength. 

SII 7nm

Has a bandwidth of 7nm and passes light at 672nm wavelength.


  • FWHM: 7±0.5nm
  • Glass Thickness 2.0+/-0.03 mm (1.25”/31mm/36mm)
  • Fine optically polished glass ensures accurate 1/4 wavefront over both surfaces
  • Around 90% transmission at selected wavelengths
  • Infrared wavelength 700-1100nm cut-off
  • <0.1% transmission of off-band, OD3 (Optical Density)

Transmission Curve

Customer reviews

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Tuesday, 24 September 2019  | 

Absolutely incredible difference in my pictures, I'm loving them!! High quality glass which you would expect for the price, but worth every penny. I'm looking forward to revisiting previous targets this winter, and adding some amazing details. The delivery was quick, and those tiny bits of glass were well protected with the packaging.


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