ZWO Ha H-Alpha 7nm 2" Filter (2 inch)

Our Price $419.95

ZWO H-alpha 7nm filter is a 2" filter with an M48x0.75 male thread.

The bandpass of the filter is 7nm, and it passes light at 656nm wavelength.

If you want high contrast astro imaging, then this Hα filter will deliver an excellent performance.

The light transmission rate for the filter comes up to 80% and the glass has been fine-optically polished to ensure an accurate 1/4 wavefront.

So, even in areas of strong light pollution, you can still explore the night sky with your imaging equipment!

Narrowband filters are great if you are looking to reduce transmissions of certain types of light like mercury vapor, both low and high pressure sodium vapor (these three coming from artificial light), and neutral oxygen emission in the atmosphere (skyglow).

Narrowband filter does not eliminate the effects of light pollution or increase the object’s brightness. In many cases, they increase the contrast between the nebula and the night sky, not brightening the nebula.

ZWO Ha H-Alpha 7nm 2 Filter (2 inch) ZWO-Ha7nm2

It can reduce the transmission of certain wavelengths of light, specifically, those produced by artificial light including mercury vapor, both high and low pressure sodium vapor lights, and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow).

Form 2018, ZWO Made progress on narrowband filters with the new standard to provide better performance.

Technical Parameter:

Name: ZWO New narrowband 2″ filter

Size: 2″

Thickness: 5mm+2.5mm(thread)

Glass thickness: 1.85mm

Thread: M48*0.75 male thread

The ZWO H-Alpha filter has a bandpass of  7nm and passes light at 656nm wavelength, the 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!

ZWO Ha H-Alpha 7nm 2 Filter (2 inch) ZWO-Ha7nm2

Technical Data

  • FWHM:7±0.5nm
  • 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

ZWO Ha H-Alpha 7nm 2 Filter (2 inch) ZWO-Ha7nm2
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