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 13 of 17 
Orion Telescopes
Orion Observer 90mm Equatorial Refractor Telescope
$329.99
 
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In Stock
  • 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
  • Two quality 1.25" Plossl eyepieces are included: a 25mm for low-power views at 36x, and a 10mm for getting in tight at 90x
  • Highly portable: the optical tube can be removed from the mount quickly via the dovetail mounting system and carried separately.


Learn more
Item #  52988b

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. 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 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 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 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.

The Observer 90 EQ 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 tripod provides solid support, and has an accessory tray to keep your extra eyepiece and Barlow within easy reach.

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

Warranty

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.

Warning

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
    Beginner
  • Optical design
    Refractor
  • Optical diameter
    90mm
  • Focal length
    900mm
  • Focal ratio
    f/10.0
  • Coatings
    Fully coated
  • Optics type
    Air-spaced doublet
  • Glass material
    Crown/Flint
  • Eyepieces
    Plossl 25.0mm,10.0mm (1.25")
  • Magnification with included eyepieces
    36x, 90x
  • Resolving power
    1.29arc*sec
  • Lowest useful magnification
    13x
  • Highest useful magnification
    180x
  • Highest theoretical magnification
    180x
  • Limiting stellar magnitude
    12.5
  • Optical quality
    Diffraction limited
  • Finder scope
    6x30
  • Focuser
    1.25" Rack-and-pinion
  • Diagonal degrees
    1.25" 90° Mirror Star
  • Secondary mirror obstruction
    40mm
  • Secondary mirror obstruction by diameter
    30%
  • Secondary mirror obstruction by area
    22%
  • Mirror coatings/over-coatings
    Aluminum & Silicon Dioxide
  • Mount type
    Equatorial
  • Dovetail bar system
    Yes
  • Motor drive compatibility
    Clock drive sold separately
  • Setting circles
    Yes
  • Polar-axis scope
    Not available
  • Counterweights
    One 4 lb.
  • Tube material
    Aluminum
  • Tripod material
    Aluminum
  • Counterweight bar length
    8 in.
  • Diameter of counterweight shaft
    13mm
  • 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.
  • 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"
Star diagonal, 1.25"
Counterweight
Counterweight shaft
Slow-motion cables (x2)
Tube ring and dovetail mounting bar assembly

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: $25.00
2 Day Delivery: $25.00
Next Day Delivery: $25.00

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