Used - Lumicon 2" Hydrogen Alpha Visual Filter
This item is out of stock but you can place an order now and we’ll ship when it becomes available.
This filter is in excellent condition.
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.
The LF3090, 2" Night Sky Hydrogen-Alpha Filter, threads into the nose-piece of industry-standard 2" Digital Imagers.