36mm Narrowband Filter

36mm Narrowband Filter


  • A Hubble image can be made by a combination of Ha SII OIII
  • SHO combination can work under heavy light pollution, so in the moonlight bright night, and will not let your equipment idle in the side
  • The Ha filter is the first narrowband addition area for the LRGB combination, and most photographers bring the black and white images of the Ha and the RGB data together to enrich the details.


       Narrow-band filters are not used to eliminate the effects of light pollution, nor are they used to increase the brightness of celestial bodies. But used to improve the nebula in the night sky contrast.

ZWO Ha filter can be through the wavelength of 653nm ~ 660nm light, light pass rate of 80% or more. If you want to shoot high contrast astronomical images, Ha narrowband filter is the best choice. It can even be under high light pollution showing the details of the nebula. 

ZWO SII narrowband filter can be through the wavelength of 669nm ~ 676nm light, it is used to observe the nebula, suitable for radiation nebula, planetary nebula, supernova debris. It and Ha, OIII can be used in conjunction with three-color synthetic shooting.

ZWO OIII narrowband filter only allows 500nm as the center of the bandwidth of 7nm light, for nebula observation, can accept the oxygen secondary ion emitted by the light. But isolate all the other light. Using OIII filters on your device allows you to observe the new look of the nebula. Even in the case of strong light pollution, still can get a clear image.



  • FWHM: 7 ± 0.5 nm
  • Thickness 2mm (1.25 "/ 31mm / 36mm)
  • Sophisticated optical polishing ensures accurate 1/4 wavefront on both sides
  • 80% transmittance H-alpha center ray 656nm (H-Alpha filter) 
  • 80% transmittance SII center light 672nm (SII filter) 
  • 80% transmittance OIII center light 500nm (OIII filter)