Orion Sirius EQ 180 f/15 Maksutov Cassegrain Catadioptric Telescope

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Orion Sirius EQ 180 f/15 Maksutov Cassegrain Catadioptric Telescope

The reason for the outstanding high-power performance of the Orion Sirius 180 Mak EQ is the 180mm (7.1") optical system with its 2,700mm focal length (f/15). With 44% more light grasp than the 150mm Mak, you'll get brighter images and better resolution. And the Maksutov-Cassegrain optical design produces larger images with less eyepiece magnification than other scopes. The Orion Sirius 180 Mak EQ is the perfect combination of brightness, contrast, and definition for planets, close double-stars, clusters, and well-defined deep-sky targets. The meniscus lens is fully multicoated for maximum light transmission, further enhancing the bright, well-defined images. No other optical design can deliver such potent optical specifications in a package that measures just 22" long and weighs in just under 16 lbs.

The visual back of the Orion Sirius 180 Mak EQ accepts 1.25" eyepieces and accessories, and a dovetail bracket on the rear cell accepts any Orion finder scope or EZ Finder. The dovetail rail on the underside of the tube makes it easy to remove the telescope or attach it to the mount for easier setup. Attach an Orion StarShoot Solar System and you'll capture gorgeous high-resolution color images on your PC!

And all that power is so easy to control! GoTo is a simple yet reliable (and very high-tech) way to control your telescope. Two stepper motors on the Sirius mount power the telescope to the object you select at a brisk 3.4 per second, putting it right in your eyepiece's field of view. You will enjoy more productive viewing sessions, seeing way more wonders in a single evening than you ever thought possible. The Orion Siruis "Big Mak" GoTo system will even take you on a guided sky tour of the best sights each month! Just do an easy initial alignment and you're ready to go!

The legendary Sirius EQ-G mount provides a steady base no matter how rugged your viewing conditions are. This substantial mount features internal dual-axis stepper motors that slew the telescope at up to 3.4’?????????????? per second. Includes an illuminated polar-axis scope, 8.3" dovetail mounting bar, and an 11 lb counterweight. The tripod is remarkably sturdy with 1.75"- diameter stainless steel legs and metal spreader plate. Requires an external 12-volt power source, like the Orion Dynamo Pro (#2307), or an AC-to-DC adapter.

Power, versatility, portability... if you're a serious big Mak fan then the Orion Sirius 180 Mak EQ is the one is for you! One-year limited warranty. For owners of the Sirius EQ-G GoTo Mount whose version of the GoTo hand controller is 3.0 or greater, the GoTo hand controller's firmware can be updated over the internet.

Orion Sirius 180 Maksuktov Cassegrain Telescope Package Features

  • Maksutov-Cassegrain telescope boasting a big 7.1" aperture and 2,700mm focal length (f/15) excels for high-power solar system use
  • An ideal Maksutov-Cassegrain for high magnification study and astrophotography of compact nebulas, star clusters, as well as the Moon and planets
  • The included Sirius EQ-G computerized GoTo equatorial mount provides stability for high-power photography and viewing, and can automatically locate and track 42,900 objects after a simple alignment process
  • Telescope optical tube measures only 22" long and weighs less than 16 lbs for compact portability and easy storage
  • Includes 9x50 finder scope, 25mm Sirius Plossl 1.25" eyepiece, 90??? 1.25" prism star diagonal, Starry Night astronomy software, and more!

Orion Product Number: 24764

Drop-Ship Policy Note: To expedite your order, this telescope (or mount) will be drop-shipped directly from Orion's warehouse to you and availability will be based on Orion's inventory levels. OPT will contact you immediately if there are any delays on shipment and will provide an estimated lead-time. If the product is not readily available, you will have the option to keep the order open with a 10% deposit. Additional Orion items may be drop-shipped along with the telescope (or mount), or shipped directly from our own OPT stock. Non-Orion items will be shipped directly from the OPT warehouse. As a courtesy, OPT will cover all costs for splitting orders and separate shipments.

If a return issue should arise with an Orion drop-ship item, please note that OPT will be required to issue a minimum 10% restocking fee for its return to Orion. With this exception, all other conditions of the OPT return policy apply. Please feel free to call us at 1-800-483-6287or e-mail us if you have any questions on Orion Drop-Ship product availability or on this policy. We're here to serve you!


Aperture180 mm (7")
Camera/Eyepiece Connection1.25
Dawes Limit0.64 arcseconds
Focal Length2700 mm
Focal Ratiof/15
Head DesignEquatorial
Instrument Capacity30 lbs
Latitude Range20 to 66 Degrees
Limiting Magnitude15
Optical DesignMaksutov Cassegrain
Power Consumption12v2A
Secondary Obstruction41mm
Telescope ConnectionVixen Style
Tube DiameterTBD mm
Tube Length572mm
Tube Weight15.9 lbs
Warranty1 Year Warranty