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

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

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

Technical Parameter:

Name:ZWONewnarrowband2filter

Size:2

Thickness:5mm+2.5mm(thread)

Glass thickness: 1.85mm

Thread:M48*0.75malethread

The ZWO H-Alpha filter has a Band-pass of 7nm and passes light at 656nm wavelength, light transmission rate comes up to 80%.Best choice of narrowband H-alpha astrophotography filter forhigh-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!

Technical Data

• FWHM70.5nm
• 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