Orion Eon 104mm (4.1") ED-X2 APO Refractor Telescope OTA

Orion Eon 104mm (4.1") ED-X2 APO Refractor Telescope OTA


Unlike most ED triplets which are made with just one ED glass element, this beautifully crafted apochromatic refractor stands above ordinary triplets since it features one element of FPL-53 ED glass and one element of FPL-51 ED glass. The Orion EON 85mm ED-X2 refractor provides superior correction of chromatic and spherical aberrations, delivering impeccable visual views and razor-sharp astrophotos without any color fringing or loss of clarity.

The EON 104mm ED-X2 sports a big, 2.7" hybrid-drive rack & pinion focuser features dual-speed (11:1) controls to easily fine-tune focus, and can support imaging gear trains weighing up to 17.6 lbs. You can rotate the focuser 360° to optimize imaging or observing convenience. The focuser has a built-in focus lock knob, and a step-down 1.25" adapter makes the EON 104mm ED-X2 compatible with either 2" or 1.25" size accessories.

The 104mm EON ED-X2 refractor measures 650mm in focal length with a fast f/6.25 focal ratio for great wide-field performance. Multiple internal baffles prevent off-axis reflections for excellent contrast, while a retractable lens shade helps eliminate glare and dew buildup. Weighing in at 14.6 lbs. with all included accessories installed, the lightweight EON 104mm ED-X2 matches well with many medium-size mounts for astrophotographic or observational performance.

The Orion EON 104mm ED-X2 f/6.25 Triplet Apo Refractor comes with a thread-on objective lens cover, two heavy-duty machined tube rings, a sturdy machined dovetail bar for easy mount attachment, and a dovetail finder scope base (installation required). An included hard carry case with a custom die-cut foam insert ensures safe transport and convenient storage of the telescope and all included accessories.

This exceptional refractor will satisfy even the most demanding astrophotographers and observers. With gloss-black machined construction, and attractive satin-red features and accessories, the Orion EON 104mm ED-X2 telescope is a truly gorgeous astronomy instrument.


  • Two ED elements; FPL-53 and FPL-51, eliminates chromatic aberration by tightly focusing visible wavelengths to a common focus
  • Retractable lens shade and thread-on metal lens cap
  • Rotatable 2.7" hybrid-drive focuser with precise, 11:1 dual-speed control supports up to 17.6 lb without slippage
  • Includes hard carry case, machined tube rings and dovetail bar, 1.25" adapter, and more
  • Includes "The Beginners Guide to Using Telescopes" written by our knowledgeable staff.


  • Aperture:104mm (4.1")
  • Focal Length: 650mm (25.6")
  • Focal Ratio: f/6.25
  • Lens Construction: triplet APO, with one element each of FPL-53 ED and FPL-51 ED glass
  • Fully multicoated
  • Aluminum tube, with multiple internal baffles
  • 2.7" hybrid drive rack and pinion focuser
  • Camera Capable:
    • USB imagers
    • All-in-one cameras via universal digital camera adapter
    • DSLR/SLR (Requires T2 ring, 2" prime focus adapter)
    • Above cameras and adapters sold separately
  • Length 57.2cm (22.5")
  • Weight 6.62kg (14.6lb)
  • Machined tube rings
  • V-series dovetail bar, 178mm (7") long, 44mm (1.75") wide
  • Aluminum carry case included
  • One year warranty