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| Lumicon International Telescope Accessories |
Lumicon's Night Sky Hydrogen-Alpha Filters are long-pass filters with a 50% transition from blocking to passing at about 640nm. At
wavelengths longer than 650nm, transmittance is 90% or above. The filter is used as an extreme anti light-pollution filter, and
for contrast-enhancement of emission nebulae and other astronomical objects bright in the infrared.
Threaded for 58mm camera lenses. |
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