Lumicon Filter Hydrogen-Alpha Pass 1.25"
Article number: | LF3085 |
Availability: | More on the Way to us |
Delivery time: | More on the Way to us |
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.