ZWO H-Alpha 7nm narrowband filter (36mm)

SKU: ZWO Ha7nmD36 Categories: , ,

The ZWO Hydrogen Alpha (H-Alpha) bandpass filter is suitable for viewing of faint emission nebula of H-Alpha line in full moonlight or in severe light pollution.

Emission nebulas  are clouds of glowing gas, which only emit light at discreet wavelengths which require filters for improved viewing and photographing. The strongest emission wavelength in a hydrogen nebula is in the deep red part of the spectrum known as the hydrogen-alpha line at 656nm.


Key features:

  • Ideal for viewing / capturing faint emission nebula of H-Alpha line in full moonlight or in severe light pollution
  • Reduces transmission of certain wavelengths of light
  • High quality optically polished to ensure accurate 1/4 wavefront
  • more than 80% transmission at passband
  • Infrared wavelength 700nm – 1100nm cut-off
  • Precision off-band blocking
  • Multilayered anti reflection coating
  • Small spectral gap to minimize effect of light pollution
  • Parfocal – thickness  2mm


$239.00 inc GST

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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.

Use it with Oxygen-III and S-II narrowband filters Set for tricolor CCD astrophotography.

Narrowband imaging with the full set (H-alpha, OIII-CCD and SII-CCD) of filters can be done with the moon visible and in heavy light pollution, so your equipment is not sitting dormant for several weeks




Size: 36 mm
Shape: Round (unmounted)
Thickness: 2.0 mm
Package: Plastic case
Transmission at 656nm (H-Alpha) 90%
Infrared wavelength: 700 – 1100nm cut off
FWHM: 7±0.5nm
In the box: 36mm Hydrogen Alpha Filter