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Orion Illuminated Centering Eyepiece - 08239

SKU: ORI-08239

Orion 20mm Illuminated Centering Eyepiece

You'll never be left in the dark with the Orion 20mm Illuminated Centering Telescope Eyepiece. Whether you're acquiring and centering stars for GoTo system alignment, lining up guide stars and/or target objects for astroimaging, or just testing the accuracy of your tracking system, the 20mm Illuminated Centering Telescope Eyepiece will quickly become one of your most trusted and useful imaging tools.

In comparison to most standard low-focal length illuminated reticle telescope eyepieces, the 20mm Illuminated Centering Telescope Eyepiece offers a relatively long 20mm focal length and a wide 70-degree apparent field-of-view, making it easier to locate desirable targets for alignment or guiding. This virtually eliminates the need for swapping out high-power illuminated reticles with lower power eyepieces in order to center objects.

These Illuminated Centering Eyepiece is fully multi-coated (all air-to-glass surfaces) with anti-reflection coatings for bright, crisp views. It features a great 16mm eye relief and the barrel is threaded for Orion 1.25" filters. The illuminator switch doubles as a "dimmer" allowing you to adjust cross-hair brightness to the desired level. The illuminator is powered by two LR-44 batteries (included) and weighs in at 8 oz. One-year limited warranty.


  • The perfect eyepiece for alignment of GoTo systems

  • An invaluable aid to centering guide stars and/or astro-imaging target objects

  • Illuminated crosshair precisely centered in eyepiece field of view for accurate results

  • Wide 70-deg apparent field of view makes acquiring and centering target objects a breeze

  • Comfortable 16mm eye relief

  • A welcome addition to any astronomers accessory case


  • Eyepiece focal length - 20.0mm

  • Barrel size - 1.25in.

  • Apparent field of view - 70.0-deg

  • Eye relief - 16.0mm

  • Coatings - Fully Multi-coated

  • Number of elements - 5

  • Filter threads - Yes

  • Parfocal - Yes

  • Field stop diameter - 25.0mm

  • Barrel security recess - No

  • Blackened lens edges - Yes

  • Rubber eyeguards - Yes

  • Body material - Aluminum

  • Weight (oz.) - 7.50

  • Warranty - One year