Lumicon 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 LF3085, Lumicon Night Sky Hydrogen-Alpha Filter, threads into the nose-piece of industry-standard 1.25" Digital Imagers. Designed for photographic use.

Threaded for 58mm camera lenses.

• 50% transition from blocking to passing at about 640nm

   

   

• At wavelengths longer than 650nm, transmittance is 90% or above

   

   

• Used as an extreme anti light-pollution filter, and for contrast-enhancement of emission nebulae and other astronomical objects bright in the infrared

   

   

• Exclusively designed dielectric coatings consist of over 30 alternating layers of several different

  materials

   

   

• Each layer is about a wavelength of light thick and has a thickness accurate to 2 - 3

  angstroms

Filter Type: H-Alpha

Application: Photographic

Filter Size: 58mm camera lens

Presentation: Round, threaded cell

Bandpass: 640nm