Orion® - H-Alfa Extra Narrowband Filter 1.25"

  • Orion's Hydrogen-Beta eyepiece filter makes it possible to view the elusive Horsehead, California, and Cocoon Nebulas in dark skies
  • Selective band-pass filter transmits only the hydrogen-beta light these faint nebulas emit
  • Filter allows you to observe targets that are considered trophies of visual astronomy
  • Best used with a moderate to large aperture telescope and clear, dark skies
  • Metal filter cell threaded to fit 1.25" eyepieces and threaded diagonal barrels

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