ZWO Filters Filter H-alpha 7nm 31mm unmounted

Product description:

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,

The half-width of 7nm is the optimal choice for astrophotography. The contrast of the nebula is raised significantly.