Orion EON 104mm ED-X2 f/6.25 Triplet Apochromatic Refractor -

  • Aperture: 104 mm (4-inch).
  • Focal Length: 650 mm.
  • Focal Ratio: f/6.25.
  • Exceptional Apochromatic Refractor.
  • Uniquely modified optical design ensures excellent optical quality and clarity.


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  • Regular price $2,399.90

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Orion EON 104mm ED-X2 f/6.25 Triplet Apochromatic Refractor -

The Orion EON 104 mm ED-X2 f/6.25 Triplet APO Refractor heralds a new era of optical excellence. This exceptional refractor will satisfy even the most demanding astrophotographers and observers. It certainly is a whole new level of quality, boasting splendid performance and interesting features.

First and foremost, this Triplet Apochromatic Refractor model features one element of FPL-53 ED Glass and one element of FPL-51 ED Glass. What does this mean for you, the consumer? With its two fluoro-crown ED glass elements and fully multi-coated optics, the Orion EON 104 mm ED-X2 refractor provides superior correction of chromatic and spherical aberrations. By suppressing these aberrations so effectively, this triplet apochromatic telescope produces impeccable visual views and razor-sharp astrophotos without any fringing or loss of clarity.

The 104 mm EON ED-X2 refractor has 650 mm in focal length with a fast f/6.25 focal ratio which is excellent for wide-field visual and photographic use. It uses multiple internal baffles to prevent off-axis reflections for excellent contrast, and a retractable lens shade helps eliminate glare and dew buildup. With gloss-black machined construction, and attractive satin-red features and accessories, the Orion EON 104 mm ED-X2 telescope is a truly gorgeous astronomy instrument that you'll be sure to appreciate having bought!

This beautiful piece of optical engineering includes a hybrid-drive 2.7-inch Rack and Pinion focuser capable of supporting imaging trains of up to 17.6-pounds of weight. The focuser features 11:1 ratio dual speed controls that allow for a remarkable level of precision and fine tune focusing. You can rotate the focuser 360-degrees to optimize imaging or observing convenience. The focuser permits 60 mm of backfocus travel, and has a built-in focus lock knob. A step-down 1.25-inch adapter makes the EON 104 mm ED-X2 compatible with either 2-inch or 1.25-inch size accessories.

The Orion EON 104 mm 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. Considering that with all the included accessories attached this OTA weighs only 14.6-pounds, the lightweight EON 104 mm ED-X2 doesn't require a gigantic mount for stable support, and matches well with many medium-size mounts.


AP 176mm)
Aperture104 mm (4")
Camera/Eyepiece Connection2" Nosepiece
CoatingsFully Multi~coated
Dawes Limit0.18 arcseconds
FL 700mm
Focal Length650 mm
Focal Ratiof/6.25
FR f/7
Glass Type1=FPL 51 and 1=FPL 53
Highest Magnification208x
Highest Useful Magnification123x
Light Gathering Power221x
Limiting Magnitude12.7
Lowest Useful Magnification15x
Optical DesignTriplet
Optics TypeAir~spaced Triplet
Resolving Power1.11 arc seconds
Tube Length571.5 mm (22.5")
Tube MaterialAluminum
Tube Weight14.6 lbs


  • EON 104 mm ED-X2 f/6.25 Triplet Apochromatic Refractor.  
  • 2.7-inch Hybrid-drive Rack and Pinion Focuser. 
  • Rotatable, Retractable Dew Shield. 
  • Dovetail Finder Scope Base.
  • Aluminum-clad Hard Carry Case.
  • 7-inch Dovetail Mounting Bar.
  • Heavy-duty Tube Rings.
  • 2-inch to 1.25-inch Step-down Adapter.
  • Manufacturer's Warranty: One Year.