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Orion Telescopes
Orion EON 90mm ED Triplet Carbon Fiber Apo Refractor
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  • Premium 90mm ED optics in a stylish, thermally stable carbon fiber tube with eye-catching anodized aluminum fittings . . . Just WOW!
  • Air-spaced triplet lens assembly utilizes Hoya FC-100 ED glass for excellent color correction, and internal knife-edge baffles ensure exceptional contrast
  • The 540mm focal length and f/6 ratio provide excellent astrophotographic speed and versatility
  • The 2.5" dual-speed, diagonal-cut, rack-and-pinion focuser features a camera angle adjuster and can hold 19.5 Lbs. of payload without slipping
  • CNC-machined hexagonal tube rings, dovetail mounting bar, integrated carry handle/accessory rail, finder scope dovetail base, and a foam-fitted hard carrying case are all included

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Item #  10386

Our popular EON line of "apo" refractors just welcomed a new entrant -- the Orion EON 90mm ED Triplet Apochromatic Carbon Fiber Refractor

This smart looking apo offers exquisite optical and build quality for next-level astrophotographic exploits. The fully multi-coated 90mm (3.5") triplet lens assembly has a focal length of 540mm, for a speedy f/6 focal ratio. One lens element is made from FCD-100 extra low dispersion "ED" glass by Hoya (Japan), which does a masterful job of minimizing chromatic aberration. Contrast is maximized with multiple internal knife-edge baffles that prevent off-axis reflections.

The glossy carbon fiber optical tube provides high tensile strength and thermal stability as the temperature changes. It sports red and black anodized machined aluminum fittings, making this telescope so attractive you'll be reluctant to stash it away in its included hard carrying case when you're not using it. The extendable dew shield thwarts moisture build-up on the lens and blocks unwanted off-axis light. When the dew shield is retracted the telescope measures just 17-3/4" in length.

The EON 90mm ED Triplet boasts a 2.5" dual-speed, hybrid rack-and-pinion focuser with 10:1 fine focus control. In our tests the focuser was able to hold 19.5 lbs. of payload without drawtube slippage - so it will definitely hold even a heavy imaging train. The focuser has a generous 90mm of drawtube travel and a backfocus distance of 147mm from the 2" accessory collar - sufficient to accommodate a camera and the component accessories you need in your imaging train.

The focuser can be rotated in two places, allowing camera framing to be set independently from positioning of the focus knobs at the desired orientation. Both the 2" accessory collar and 1.25" adapter feature a twist-tight locking mechanism. The focuser is also equipped with a dovetail finder scope base that accommodates optional Orion finder scopes and guide scopes.

We tested EON 90mm ED Triplet with the Orion Field Flattener for Small Telescopes (#8893) and were pleasantly surprised how flat the field was even with a full-frame camera. Only slight star elongation was evident at the edges of the 36mm x 24mm frame. With an APS-C camera sensor you'd be hard-pressed to see any.

M42 The Orion Nebula

The Orion Nebula complex photographed with the Orion EON 90mm ED Triplet Carbon Fiber Apo and a modified Canon EOS 6D DSLR, plus the Orion Field Flattener for Short Refractors (#8893).

The EON 90mm ED Triplet comes with two CNC-machined hexagonal tube rings with multiple threaded holes on the sides for extra accessory mounting possibilities. And we love the carry handle bolted to the top of the tube rings, which doubles as an accessory rail. The included Vixen-style dovetail mounting bar is 9.6" long and fits any compatible mount saddle. The solidly built EON 90mm ED Triplet weighs in at 9 lbs., 12.4 oz. So it is easily supported by a mid-sized mount.

Lastly, if you're like us you occasionally like to swap out a camera for an eyepiece and diagonal for some real-time observing. With the EON 90mm ED Triplet you'll discover that it makes a fine instrument for wide-field visual examination of nebulas and other deep-sky fare. Add a Barlow lens to boost the power and you will also enjoy crisp, vivid views of the major planets and the lunar surface.

We are excited about this new addition to our EON line of apochromatic refractors. The Orion EON 90mm ED Triplet Apochromatic Carbon Fiber Refractor is an affordably priced, feature-rich and attractively styled telescope that offers high-performance astrophotographic capability in a compact package. Get yours today!


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. For complete warranty details contact us at 800-447-1001.


Please note this product was not designed or intended by the manufacturer for use by a child 12 years of age or younger.

Product Support
Visit our product support section for instruction manuals and more
  • Best for viewing
    Brighter deep sky
  • Best for imaging
    Deep sky
  • User level
  • Optical design
  • Front-end outside tube diameter
    4.80 in.
  • Optical diameter
  • Focal length
  • Focal ratio
  • Coatings
    Fully multi-coated
  • Optics type
    Air-spaced triplet
  • Glass material
    Extra low dispersion FCD-100
  • Eyepieces
  • Resolving power
  • Lowest useful magnification
  • Highest useful magnification
  • Highest theoretical magnification
  • Limiting stellar magnitude
  • Optical quality
    Diffraction limited
  • Finder scope
  • Focuser
    2.5" dual-speed Rack-and-pinion
  • Mount type
    Optical Tube without Mount
  • Astro-imaging capability
    Lunar, planetary & long exposure
  • Backfocus distance
  • Tube material
    Carbon graphite
  • Length of optical tube
    17.7 in.
  • Weight, optical tube
    9.8 lbs.
  • Additional included accessories
    Vixen-style dovetail bar, 244mm length, Foam-fitted hard carrying case, CNC-machined hexagonal tube rings
  • Other features
    Dovetail finder scope base, Dual-speed 2.5" R&P focuser with 19.5-lb. capacity, Carrying handle that doubles as accessory rail
  • Warranty
    One year

90mm f/6 ED Triplet OTA
Hinged tube rings
Vixen style dovetail mounting bar
1.25" adapter
Thumbscrew (for dew shield)
Dust cap
Carry case

Orders received by 1pm Eastern Standard Time for in-stock items ship the same business day. Order received after noon will ship the next business day. When an item is not in-stock we will ship it as soon as it becomes available. Typically in-stock items will ship first and backordered items will follow as soon as they are available. You have the option in check out to request that your order ship complete, if you'd prefer.

A per-item shipping charge (in addition to the standard shipping and handling charge) applies to this product due to its size and weight. This charge varies based on the shipping method.

Standard Delivery: $0.00
Standard Delivery to Canada: $25.00
3 Day Delivery: $50.00
2 Day Delivery: $50.00
Next Day Delivery: $50.00

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