Lumicon 2" Hydrogen-Alpha Pass Filter

Article number: LF3090
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Lumicon’s Night Sky H-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.

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