Lumicon H-Alpha Filter 72mm
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This "night sky" long-pass filter has 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. I used it with my modified Canon 20D to successfully image during the full moon (see M17).
Threaded for 72mm camera lenses. Comes with 72mm-->62mm Tokina adapter ring. Shipping is free. CONUS only.
Threaded for 72mm camera lenses. Comes with 72mm-->62mm Tokina adapter ring. Shipping is free. CONUS only.
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