ZWO 36mm OIII 7nm Unmounted Narrowband Filter

ZWO 36mm OIII 7nm Unmounted Narrowband Filter


Incoming - Shipped 7-10 working days.

Model:  zwo_oiii_36-7nm
Part Number:  ZWO-OIII7nmD36
Brand:  ZWO


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

Passes 7nm bandwidth of light centered on a 500nm wavelength, which corresponds to OIII emission lines. All other light is blocked.

Adding a ZWO O-III Narrowband filter to your imaging collection will take you beyond RGB imaging and reveals your favorite nebulas in a totally new light, no matter how polluted your skies may be! 


  • 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
  • Approx 90% transmission at major OIII line 500nm
  • Infrared wavelength 700-1100nm cut-off
  • <0.1% transmission of off-band, OD3 (Optical Density)

Transmission Curve

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