Orion 8921 9mm Expanse Telescope Eyepiece

With their 66° apparent field of view, our Expanse wide-field eyepieces will definitely turn up the Wow! factor in your deep-sky observing experiences! Imagine taking in objects like the Andromeda Galaxy, the Double Cluster, or the star clouds in Sagittarius in one sweep! With an Expanse in your focuser, you can! Expanse oculars have big eye lenses and great eye relief 15mm. Eyeglass wearers can view the entire field without removing their glasses. All eyepiece elements are fully coated, with the outer lens multi-coated for additional light transmission. Each 1.25″ aluminum barrel is threaded for filters and internally blackened to eliminate internal scattering. And their fold-down rubber eyeguards enhance contrast by blocking stray light. With our Expanse eyepieces you get a super wide field of view and superior optical performance. And check out the price. You also get a bargain!

Product Features

  • 9mm 1.25″ telescope eyepiece offers a wide field of view and superior optical performance at a bargain price
  • Nice 15mm eye relief lets eyeglass wearers view the entire field without removing their glasses
  • Wide 66 degrees apparent field of view lets you see more of the sky
  • Delivers sharp images with good color correction and contrast
  • Aluminum 1.25″ eyepiece barrel is internally blackened to eliminate light scattering, and is threaded to accept 1.25″ Orion filters

2 Comments on “Orion 8921 9mm Expanse Telescope Eyepiece”

  1. product user

    great but clones are less money This eyepiece gives great views in telescopes of all focal ratios because it incorporates additional lens elements that the 15 and 20mm linemates do not have. Think of it as a “poor man’s Nagler.”It is overpriced at $60 plus shipping. The identical eyepiece is available elsewhere (Agena and Owl) for under $40 with free shipping.

  2. From Detroit

    Wonderful addition to my meager eyepiece collection I have an Orion SkyQuest XT6 for over 10 years, and I’ve only had 3 eyepieces the whole time. Their standard Sirius Plossl 25mm, 17mm and 10mm. For the most part, the 10mm is pretty much useless, as the field of vision is so narrow that constant adjustments need to be made. I decided to give the Expanse series a try. This eyepiece is by far the best in the of the 4. Near Detroit, the light pollution is pretty bad. Viewing the plants and the moon is usually OK. My previous higher powered eyepieces usually made things look really bright and blurry. The Orion Nebula is usually a grey smudge. With the 9mm Expanse, I was able to see more shape to the cloud, and even a handful of stars in its heart. Cloud bands on Jupiter never looked better! I was also able to get a significant amount more detail on the moons surface than what I am used to. Looking at the sun was uneventful today — only two sunspots.Ultimately, this is definitely worth buying!

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