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 1 of 7 
Orion Telescopes
Orion Observer 90mm Equatorial Refractor Telescope Kit
Was 
$349.99
Now 
$329.99
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$20.00
If purchased separately $364.95
 
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  • Sharp 90mm (3.5") lens optics and high-power views make this equatorial refractor telescope the perfect instrument for viewing the Moon, planets, and bright deep-space objects
  • Two quality 1.25" Plossl eyepieces are included: a 25mm for 36x magnification, and a 10mm for getting in tight at 90x. Barrels are threaded to accept Orion filters
  • The sturdy equatorial mount lets you manually track celestial objects effortlessly as they move across the sky
  • This value-packed kit includes essential extras like Orion's MoonMap 260, Star Target Planisphere, and Color Filter Set
  • Highly portable: the optical tube can be removed from the mount quickly via the dovetail mounting system and carried separately


Learn more
Item #  21506b

Beginning skywatchers looking for a 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. Refractor telescopes are coveted for their crisp, sharp images and their lack of needed maintenance by the owner compared to, say, reflector telescopes whose optics must be regularly re-aligned, or collimated.

This family friendly telescope boasts a 90mm-diameter (3.5"), fully antireflection coated achromatic lens of 900mm focal length. That means that with the 25mm and 10mm 1.25" Plossl eyepieces included - a cut way above the cheapie eyepieces many beginner telescope come with - you'll enjoy views at 36x and 90x, respectively. When aimed at our nearest neighbor in space, the Moon, the Observer 90 EQ yields tack-sharp views of the rocky lunar surface with craters and mountainous regions visible in crisp, high-contrast detail. Both eyepieces feature multi-coatings for great light transmission and are threaded for optional Orion filters. The 1.25" rack and pinion focuser lets you dial in the perfect focus. This telescope is also equipped with a 6x30 finder scope to help you find and center your celestial target for viewing.

The Observer 90mm EQ includes a sturdy equatorial mount designed specifically for astronomical viewing. With its dovetail mounting saddle, you can pop the optical tube on or off quickly for easy setup and transport. Dual slow-motion cables let you track objects manually to keep them centered in the eyepiece. The aluminum tripod adjusts to a comfortable height and has a handy accessory tray for convenient storage of gear while you're probing the starry skies. The assembled telescope weighs just under 17 lbs.

This Orion Observer 90mm EQ Refractor Telescope Kit includes an exciting collection of essential items that will help you get the most out of your new telescope.

star target

Learn "What's Up" on any night with the Orion Star Target Planisphere

This handy star wheel makes it easy to see "what's up" in the night sky any night of the year. Dial in your local date and time and it shows you the locations of the constellations and deep-sky objects in the night sky. Use it to plan a stargazing session, or see what time of year your favorite constellation will be visible. Designed for use in 30-50 latitudes.

Explore the Moon's cratered surface with the help of the MoonMap 260

The included Orion MoonMap 260 will help the whole family learn the names and locations of more than 260 craters, mountains, valleys, "seas" and other interesting lunar features you can explore with your telescope. Use the MoonMap 260 to identify craters you've observed, or use it before you go out with a telescope to plan a night full of Moon-watching family fun.

Cut the Moon's glare and see more detail on its surface with the Orion 13% Transmission Moon Filter

This popular accessory reduces glare and boosts contrast so you can enjoy more-detailed views of lunar surface features. It blocks 87% of the Moon's brightness to provide a more comfortable view and reveal subtle details. It's a neutral density filter that will not alter the natural color of the Moon, either.

Reveal subtle markings and features with the included Color Filter Set

The set of four color eyepiece filters that come in this kit will help enhance subtle details of the planets and the Moon by selectively increasing the contrast between markings of different hues. The included Set of Four Color Filters includes our most popular color planetary telescope eyepiece filters: #15 Deep Yellow, #25 Red, #58 Green, and #80A Medium Blue. These filters are vat-dyed for even color coating and then anti-reflection coated for maximum transmission.

With all these must-have extras, the Orion Observer 90mm Equatorial Refractor Telescope Kit is just too good a deal to pass up.

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
    .965"/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
  • Astro-imaging capability
    Simple moon shots
  • 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.
  • Additional included accessories
    Moon filter, 13% transmission, Set of Four Color Filters, Orion MoonMap 260 and Star Target Planisphere
  • 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" Orion Basic Set of Four Color Filters
Orion MoonMap 260
Orion Star Target Planisphere, 30-50 degree
1.25" Orion E-Series 13% Transmission Moon Filter
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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