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Orion Telescopes
Orion Sirius EON 120mm ED EQ-G GoTo Apo Refractor Telescope
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  • Complete premium-quality refractor telescope system with computerized GoTo mount for visual or astrophotographic pursuits
  • The EON 120ED refractor telescope's 120mm f/7.5 apochromatic optics eliminate chromatic aberration for clean, sharp astrophotographs
  • Sleek gloss-machined dual-speed Crayford 2" telescope focuser provides zero image shift and 11:1 micro-focusing so you can easily achieve optimal focus
  • Sirius EQ-G mount offers stability, tracking precision, and computerized GoTo pointing to 42,900 objects
  • Includes 9x50 finder scope, 2" dielectric diagonal, 2" 32mm Q70 and 1.25" 10mm Plossl eyepieces, Starry Night astronomy software, and more!

Learn more
Item #  24777

Put a high-performance visual and imaging refractor on a solid GoTo mount and you've got a setup with virtually limitless potential. That's the Sirius EON 120ED in a nutshell. It's a state-of-the-art telescope that delivers strikingly clean views of planetary subjects yet has enough aperture to render revealing looks at all the Messier objects and many other deep-space denizens. And if your interest is CCD or DSLR imaging, you've got an unbeatable system for advancing your skills.

The EON 120ED's optics consist of a fully multi-coated, air-spaced 120mm objective doublet lens of exceptional quality, containing one element of FPL-53 extra-low dispersion "ED" optical glass. The Sirius EQ-G mount offers a combination of stability, tracking and guiding precision, and computerized pointing to any of 42,900 celestial objects.You'll just need a 12-volt DC power source or AC-to-DC adapter. The included accessory package for the Sirius EON 120ED EQ-G contains a 9x50 dovetail finder scope, 2" dielectric mirror diagonal, 2" 32mm Q70 eyepiece, and a 1.25" 10mm HighLight Plossl eyepiece. The optical tube comes with an aluminum objective lens cap and a carrying case with custom foam interior and carrying handle.


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 800-676-1343.


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
  • Optical diameter
  • Finder scope lens diameter
  • Focal length
  • Focal ratio
  • Coatings
    Fully multi-coated
  • Optics type
    Air-spaced doublet
  • Glass material
    Extra low dispersion FPL-53
  • Eyepieces
    3-Element 32.0mm (2"),10.0mm (1.25")
  • Magnification with included eyepieces
    28x, 90x
  • Resolving power
  • Lowest useful magnification
  • Highest useful magnification
  • Highest theoretical magnification
  • Limiting stellar magnitude
  • Optical quality
    Diffraction limited
  • Finder scope
  • Focuser
    2" dual-speed Crayford
  • Diagonal degrees
    2" 90° Mirror Star
  • Mount type
  • Astro-imaging capability
    Lunar, planetary & long exposure
  • Weight rating
    30 lbs.
  • Dovetail bar system
  • Motor drive compatibility
    Clock drive included
  • Computerized compatibility
    Go-To included
  • Alignment procedure
    3-Star Alignment, 2-Star Alignment, 1-Star Alignment
  • Number of objects in database
  • Tracking rates
    Sidereal, Solar and Lunar
  • Motor speeds
    3.4°/sec, 600x, 500x, 400x, 64x, 32x, 16x, 8x, 2x, 1.75x, 1.5x, 1.25x
  • Motor type
    Microstep driven 1.8°stepper motors
  • Bearing material
    Sealed ball bearings
  • Power requirement
    12-volt DC - 2A (tip positive)
  • PEC
  • GPS
    Sold separately
  • Backlash compensation
  • Latitude range
  • Setting circles
  • Polar-axis scope
  • Counterweights
    One 11 lb.
  • Available ports
    RS-232, autoguider
  • Tripod material
  • Tripod leg diameter
    1.75 in.
  • Counterweight bar length
    8 in.
  • Diameter of counterweight shaft
  • Height range of mount
    42.00 in. - 55.00 in.
  • Weight, optical tube
    14.6 lbs.
  • Weight, mount/tripod
    43.0 lbs.
  • Weight, fully assembled
    68.8 lbs.
  • Warranty
    One year
Orion EON 120mm ED f/7.5 refractor telescope
Sirius EQ-G Computerized GoTo mount
Orion 9x50 finder scope
2" dielectric mirror diagonal
2" 32mm Q70 telescope eyepiece
1.25" 10mm Orion HighLight Plossl telescope eyepiece
Orion foam-lined carry case for optical tube

Orders received by 1pm Eastern Standard Time for in-stock item 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
3 Day Delivery: $194.00
2 Day Delivery: $194.00
Next Day Delivery: $254.00

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