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Orion Telescopes
Orion Observer 90mm Equatorial Refractor Motor Drive Kit
If purchased separately $432.96
You Save $42.97
Accepted Payment
Expected Ship Date: 08/15/2024

  • This wonderfully capable equatorial refractor telescope gives beginning stargazers an exciting look at solar system favorites and beyond
  • Its 90mm (3.5") lens optics and 900mm focal length excel for stunning views of the lunar surface, Saturn's rings, and bright deep-sky gems like Great Hercules Cluster
  • The sturdy EQ3-class equatorial mount and aluminum tripod is a big upgrade from the mounts that comparable telescopes on the market come with
  • The included Electronic DC Motor Drive tracks objects as they drift through the sky keeping your viewing target centered in the eyepiece
  • The soft-bound 174 page Telescope Observer's Guide provides helpful tips and tricks to enhance your observing experience

Learn more
Item #  21710

Beginning skywatchers looking for a low maintenance telescope that can serve up vivid, sharp images of the Moon, planets, and brighter deep-space objects need look no further than the Orion Observer 90mm Equatorial Refractor Motor Drive Kit. A great telescope for the whole family, the Observer 90 EQ's fully antireflection coated 90mm-diameter (3.5") front lens boasts strong magnifying power. With the included 25mm and 10mm Plossl telescope eyepieces you will view distant worlds in high-contrast detail at 36x and 90x! Jupiter's cloud bands are easily discerned, as are all four of its major moons. Saturn's rings, sharp and dazzling. And the lunar surface teems with craters and mountains in rugged relief.

While the Observer 90 EQ telescope excels at lunar and planetary observing, it can also provide great views of many more-distant objects. At 36x the Orion Nebula exhibits the four Trapezium stars as perfect blue pinpoints surrounded by greenish gas. Pop in the 10mm telescope eyepiece to boost the power to 90x and — wow! — the nebulosity spans nearly the entire eyepiece field of view! In the summer sky the Great Hercules Star Cluster (M13) starts to resolve into tiny stellar pinpoints. Also included is a 2x Shorty Barlow lens, which doubles the magnification of each eyepiece for incredibly high resolution of the moon and planets!

The Observer 90 EQ telescope features a 1.25" rack-and-pinion focuser for dialing in the sharpest view. A 90-degree star diagonal inserted in the focuser provides a comfortable viewing angle. The 6x30 crosshair finder scope helps you locate your targets.

The Observer's sturdy equatorial mount can be quickly polar-aligned to allow easy "tracking" of celestial objects as they move slowly across the sky, using just one of the two slow-motion knobs. Use both to center objects in the telescope's field of view. The extendable aluminum telescope tripod provides solid support, and has an accessory tray to keep your extra eyepiece and Barlow within easy reach.

The included motor drive keeps your target object centered automatically.

This special combo includes the Orion Electronic DC Tracking Drive to pair with the Observer EQ telescope mount allowing you to keep your target object centered in the telescope eyepiece. The drive's precision motor provides sidereal-rate tracking in right ascension, which is the rate that stars and deep-sky objects move across the sky. Even as different family members take their turn viewing your object remains on target. This means you can relax and enjoy the view as long as you wish without the object drifting out of view. Push button controls with 2x, 4x, and pause mode allows for easy centering of your object. A clutch release allows use of the mount's manual controls when desired. Runs on four 1.5 volt D batteries (not included). Works in both the northern and southern hemispheres.

OTOG book

Detailed Observer's Guide highlights over 60 celestial objects to observe in a small telescope.

Packed with helpful hints and tips for exploring star clusters, multiple stars, nebulas, and even the Andromeda Galaxy. Useful resources for each object include a map, finder scope view, depiction of what you can expect to see in your telescope eyepiece, and more. A thorough guide to the night sky for stargazers of all skill levels from beginners to more experienced amateur astronomers. Softbound, 174 pages.

The telescope weighs under 17 lbs. total, including the easily removable counterweight, so it's easy to take outside for impromptu observing sessions.


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
    Lunar & planetary
  • User level
  • Optical design
  • Optical diameter
  • Focal length
  • Focal ratio
  • Coatings
    Fully coated
  • Optics type
    Air-spaced doublet
  • Glass material
  • Eyepieces
    Plossl 25.0mm,10.0mm (1.25")
  • Magnification with included eyepieces
    36x, 90x
  • Resolving power
  • Lowest useful magnification
  • Highest useful magnification
  • Highest theoretical magnification
  • Limiting stellar magnitude
  • Optical quality
    Diffraction limited
  • Finder scope
  • Focuser
    1.25" Rack-and-pinion
  • Diagonal degrees
    1.25" 90° Mirror Star
  • Mirror coatings/over-coatings
    Aluminum & Silicon Dioxide
  • Mount type
  • Dovetail bar system
  • Motor drive compatibility
    Clock drive included
  • Tracking rates
  • Motor speeds
    Sidereal, 2x, 4x, Pause Mode
  • Setting circles
  • Polar-axis scope
    Not available
  • Counterweights
    One 4 lb.
  • Tube material
  • Tripod material
  • Counterweight bar length
    8 in.
  • Diameter of counterweight shaft
  • Height range of mount
    37.50 in. - 69.50 in.
  • Length of optical tube
    34.0 in.
  • Weight, optical tube
    4.7 lbs.
  • Weight, mount/tripod
    11.4 lbs.
  • Weight, fully assembled
    16.1 lbs.
  • Additional included accessories
    Electronic DC Motor Drive, 1.25" Shorty 2x Barlow
  • Other features
    Dual slow-motion cables, Dovetail saddle for easy attach/detach of OTA, Dew shield reduces off-axis glare and dew on lens
  • Warranty
    One year

Optical tube assembly
EQ mount
Aluminum tripod
Accessory tray
6x30 finder scope with bracket
25mm Plossl eyepiece, 1.25"
10mm Plossl eyepiece, 1.25"
1.25" Shorty 2x Barlow Lens
Star diagonal, 1.25"
Counterweight shaft
Slow-motion cables (x2)
Tube ring and dovetail mounting bar assembly
Telescope Observer's Guide
Tracking Drive System

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: $35.00
3 Day Delivery: $45.00
2 Day Delivery: $45.00
Next Day Delivery: $50.00

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