• A beautifully constructed, 115mm (4.5″) aperture triplet ED apochromat ideal for both astrophotography and serious visual observations
  • Fully multi-coated, three-lens ED optics and versatile f/7.0 focal ratio yields high-contrast images with excellent color correction and sharpness
  • Rock-solid, rotatable 3″ dual-speed (11:1) Crayford focuser provides precise focus control and stable support of imaging accessories
  • Includes two split-clamp tube rings, narrow dovetail bar, thread-on metal objective cap, and a hard case with a custom die-cut foam insert for protection during transport and storage
  • Relatively lightweight 15.2 lb. optical tube can be stably supported by medium-size equatorial mounts


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Description en français à venir


With exceptional optics, top-notch features and beautiful fit and finish, the ORION EON 115MM ED TRIPLET APO refractor telescope offers wide-field observers and astrophotographers an impeccably crafted, true-color instrument at a great price.

This premium refractor telescope’s generous, 115mm (4.5″) aperture collects ample light from faint deep-sky objects to provide crisp images with excellent color correction by virtue of the element of FK-61 extra-low dispersion (« ED ») optical glass in its air-spaced triplet objective lens. The apochromatic refractor’s medium 805mm focal length gives it a fairly fast, f/7.0 f-ratio which performs exceptionally well for wide-field visual use or deep-sky astrophotography. Multilayer anti-reflection coatings on every air-to-glass lens surface maximizes light transmission; while an extendable dew shield, blackened lens edges, and multiple internal knife-edge baffles eliminate off-axis reflections and glare to ensure excellent contrast.

A massive, 3″ dual-speed (11:1) Crayford focuser provides precise, backlash-free focus control and easily supports heavy astrophotography gear. The rugged focuser’s drawtube sports an engraved millimeter scale and focus-lock thumbscrew to aid in focus point repeatability – a great time-saver. The EON 115mm ED’s focuser can be rotated in two places, allowing camera framing to be set independently from your preferred positioning of the telescope focus knobs. Non-marring brass compression rings in the 2″ focuser drawtube and included step-down 1.25″ adapter keep installed cameras, diagonals and other accessories free of scratches and thumbscrew gouges.

Not only is the EON 115mm ED Refractor a great wide-field performer, it’s also conveniently compact and measures just 27.75″ with its sliding dew shield retracted for easy transport and storage in the included 30.5″ long foam-lined hard carry case. Unlike heavier, bulkier astrophotography telescopes, the relatively lightweight, 15.2 lb. EON 115mm optical tube needs only a medium-sized equatorial mount to support it.

The EON 115mm refractor telescope features a dovetail finder scope base for use of optional aiming devices or Mini Guide Scopes. A thread-on metal objective lens cap, a narrow « Vixen-style » dovetail mounting bar and two heavy-duty hinged tube rings with multiple, pre-drilled and tapped M6 holes along the top and bottom are included.

If you’re looking for an exquisitely constructed « apo » refractor that can achieve amazing results for both astrophotography and serious visual observing, the versatile Orion EON 115mm ED Triplet is an ideal choice.


Limited Warranty against defects in materials or workmanship for one year from date of purchase. This warranty is for the benefit of the original retail purchaser only.

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Optical design: Refractor
Optical diameter: 115mm
Focal length: 805mm
Focal ratio: f/7.0
Coatings: Fully multi-coated
Optics type: Air-spaced triplet
Glass material: Extra low dispersion
Eyepieces: None
Resolving power: 1.01arc*sec
Lowest useful magnification: 16x
Highest useful magnification: 230x
Highest theoretical magnification: 230x
Limiting stellar magnitude: 13.0
Optical quality: Diffraction limited
Finder scope: None
Focuser: 3" dual-speed rotatable Crayford
Mount type: Optical Tube without Mount
Tube material: Aluminum
Length of optical tube: 34.7 in.
Weight, optical tube: 15.2 lbs.
Additional included accessories: Hard case, Tube rings, Vixen dovetail mounting bar, 1.25" Adapter with compression ring
Other features: Retractable Dew Shield, Dovetail Base for Finder Scope
Warranty : One year

Orion EON 115mm ED f/7 triplet refractor optical tube assembly with 3" dual-speed Crayford focuser
1.25" Adapter with compression ring
Two hinged tube rings
Narrow "Vixen-style" dovetail mounting bar, 9.7" length
Hard carrying case with die-cut foam interior
Starry Night SE astronomy software digital download insert

Orion EON 115mm and 130mm Manual