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Orion Telescopes
Orion 150mm Maksutov-Cassegrain Telescope Optical Tube
3 easy payments of $233.33
With payment plan
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  • Compact f/12 Maksutov-Cassegrain telescope with 150mm (5.9") aperture delivers high resolution images for terrestrial or celestial pursuits
  • Long 1800mm focal length ideal for high-power observation of Moon, planets, and compact deep-sky objects
  • Excellent telescope for lunar and planetary photography
  • Fully multi-coated Maksutov-Cassegrain meniscus lens ensures maximum light transmission for bright, high-contrast views and images
  • Conveniently portable telescope measures just 17.75" long (including 2" visual back on rear cell) and weighs 11.5 lbs.

Learn more
Item #  09967b

The compact Orion 150mm Mak-Cass Telescope Optical Tube Assembly (OTA) opens up new vistas of the celestial landscape for your viewing pleasure, putting superior resolving power at your disposal. The optical tube's 150mm-diameter (5.9") Maksutov-Cassegrain optics take in 40% more light than its 127mm counterpart, which means this big Mak will resolve finer detail in lunar and planetary subjects and permit exploration of a wider array of deep-sky objects. Thanks to its combination of long focal length and substantial aperture, this compact catadioptric telescope delivers exceptionally crisp, high-power views of the Moon and planets, as well as smaller deep space objects like globular clusters and brighter planetary nebulas. This Mak-Cass OTA is an ideal high-power specialist for both observational astronomy and astrophotography.
Not limited solely to nighttime activities, the versatile 150mm f/12 Mak-Cass OTA can be used during the day for great terrestrial views when used with optional eyepieces and a 45 correct-image diagonal (sold separately).  

The 150mm Mak-Cass telescope's meniscus lens is fully multi-coated for maximum light transmission so views and images are delightfully sharp and high in contrast. Its long focal length of 1800mm (f/12.0) belies the telescope's compact tube, which measures just 17.75" long (including visual back), for excellent portability. The telescope's 2" visual back and included 1.25" step-down adapter allows use of both 2" and 1.25" size diagonals, eyepieces and accessories (all accessories sold separately).

The sturdy aluminum Orion 150mm Maksutov-Cassegrain Telescope Optical Tube is outfitted with rugged metal front and rear cells. With its low-maintenance, closed-tube design, you won't have to worry about collimation adjustments since the 150mm Mak-Cass optics are permanently and precisely aligned at the factory.  

Weighing just 11.5 lbs., this powerful 150mm Mak-Cass works well on medium-sized equatorial and altazimuth mounts. A built-in, Vixen-style narrow dovetail mounting bar along the bottom of the telescope makes it easy to attach to compatible Orion mounts. Dovetail finder scope base accepts any Orion finder scope or reflex sight.


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
    Lunar & planetary
  • User level
  • Optical design
  • Optical diameter
  • Focal length
  • Focal ratio
  • Resolving power
  • Lowest useful magnification
  • Highest useful magnification
  • Highest theoretical magnification
  • Limiting stellar magnitude
  • Optical quality
    Diffraction limited
  • Focuser
  • Secondary mirror obstruction
  • Secondary mirror obstruction by diameter
  • Secondary mirror obstruction by area
  • Mirror coatings/over-coatings
    Magnesium Fluoride
  • Mount type
    Optical Tube without Mount
  • Astro-imaging capability
    Lunar, planetary & long exposure
  • Tube material
  • Length of optical tube
    17.7 in.
  • Weight, optical tube
    11.5 lbs.
  • Weight, fully assembled
    12.4 lbs.
  • Additional included accessories
    2" visual back accepts 2" and 1.25" accessories, Front dust cover, Dovetail mounting rail
  • Other features
    Dovetail finder scope base, accepts Orion finders, Fully multi-coated meniscus lens, Collimatable primary mirror
  • Warranty
    One year

Orion 150mm f/12 Maksutov-Cassegrain optical tube assembly
2" visual back
2"-to-1.25" adapter
Dovetail mounting rail
Dovetail finder base
Dust cap
Starry Night SE astronomy software digital download insert

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: $10.00
3 Day Delivery: $39.00
2 Day Delivery: $39.00
Next Day Delivery: $51.00

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