ZWO New Narrowband Filter Set 7nm


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New ZWO 7nm Narrowband Filter Sets

Comprising OIII, H-alpha and SII in 7nm bandwidth for imaging in Hubble Palette.

  • OIII 501nm
  • Ha 656nm
  • SII 672nm

Expand your Deep Sky Imaging to a new level.

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1.25 inch suits the new ZWO 8 position 1.25 inch Filterwheel

31mm unmounted suits the new ZWO 8 position 31mm Filterwheel

36mm unmounted suits the new  ZWO 7 position 36mm Filterwheel

Technical Parameter:

Name: ZWO narrowband 31mm filter

Size: D=31mm

Thickness: 2mm

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.

31mm HA
31mm HA

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 tricolor CCD astrophotography.

31mm SII
31mm SII

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

31mm OIII
31mm OIII

Filter Orientation

You can judge which side faces the camera by the color like below:

New Ha filter:


New SII filter:

For New OIII filter ,Old Ha/SII/OIII filter:

  1. Lay the filter down flat;
  2. Put a pen on the top of it ;
  3. if you can see two shadow, this side has anti-reflective coating, and it should face to the camera.4. if you can only see one shadow, this side has multilayer coating, and should face to the telescope.

Technical Data

  • FWHM:7±0.5nm
  • Glass Thickness 2.0+/-0.03 mm  (1.25”/31mm/36mm)
  • Fine-optically polished to ensure accurate 1/4 wavefront  over the both surfaces
  • About 90% transmission at H-alpha line 656nm (H-Alpha filter )
  • About 90% transmission at SII line 672nm (SII filter )
  • About 90% transmission at major OIII line 500nm (OIII filter )
  • Infrared wavelength 700-1100nm cut-off
  • <0.1% transmission of off-band, OD3(Optical Density)

Transmission Curve

NB Transmission
NB Transmission

Image Test:

Here is a test of ZWO Ha Filters (ASI1600 mono camera, single frame, 300s, DDP in MaximD)


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