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Orion Telescopes
Orion StarSeeker IV 150mm Mak-Cass GoTo without Controller
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  • This 5.9" diameter GoTo Mak-Cass boasts big aperture and a super-long 1800mm focal length for detailed, high-power views of the Moon, planets, and deep-sky objects
  • The mount is Wi-Fi enabled to allow wireless control from any iOS or Android smartphone or tablet using the SynScan Pro app. (Optional wired hand controller is available for purchase, if desired.)
  • Huge GoTo database of thousands of objects, and Tour mode takes you to the night's best objects one by one!
  • After an object is selected, the StarSeeker IV locates and tracks it automatically so you can relax and enjoy the view
  • Includes 23mm (78x) and 10mm (180x) wide-field 60-degree eyepieces, EZ Finder II reflex sight, 1.25" star diagonal, MoonMap 260, DeepMap 600 star chart, and more!

Learn more
Item #  08278

Our biggest Maksutov-Cassegrain StarSeeker IV GoTo telescope combines motorized object-location technology with high-power optical performance at a great price. This smart GoTo telescope will lead you and your family on a guided tour of the stars on any clear night.

Its compact optical tube houses big 5.9" aperture Maksutov-Cassegrain mirror and lens optics with a long 1800mm focal length, for super sharp resolution and high magnifications. This portable powerhouse will get you in tight on Saturn's rings, Jupiter's cloud bands, lunar craters, and globular clusters that just won't resolve in smaller telescopes.

The StarSeeker IV 150mm GoTo Maksutov-Cassegrain features a 2" visual back so you can use optional 2" diagonals and eyepieces if desired (sold separately). A handy 1.25" step-down adapter is included for the 2" visual back to allow easy installation of the included 1.25" accessories.

The included Orion StarSeeker IV GoTo Mount features a state-of-the-art object location system that makes finding celestial objects in the night sky easy and fun. The mount is now offered without the SynScan Hand Controller to both save you money and let you control your telescope wirelessly from your smartphone or tablet using the FREE SynScan Pro app. The SynScan Pro app is available for iOS and Android devices.

(NOTE: The StarSeeker IV GoTo Mount is compatible with the SynScan hand controller, which is available for purchase as an optional accessory, should you prefer a dedicated, cabled handset over wireless operation by smartphone. Find it under "We Also Suggest" at right.)

The free SynScan Pro app includes a database of over 10,000 deep-sky objects, so you will never run out of fascinating celestial gems to observe and study! Once you select and locate an object from one of the SynScan Pro app's intuitive object menus, the StarSeeker IV GoTo Mount's dual servo motors will automatically track the object's motion across the sky to keep it in your instrument's field of view. Even a novice stargazer will quickly learn how to explore the heavens with this high-tech mount and app in just a couple of sessions. One really cool feature: the "Tour" mode identifies the best objects visible at the time you're observing and will lead you right to them!

SynScan Pro App on the App Store

SynScan Pro App on Google Play


This fourth generation StarSeeker telescope features dual optical encoders on each axis of motion which allow you to move the telescope tube either manually by hand, or electronically by using the directional arrows on the SynScan Pro app. Moving the telescope manually will not require a re-do of the GoTo alignment.

This Orion StarSeeker IV GoTo Telescope setup includes an array of terrific accessories:

Download the FREE SynScan Pro app to control your telescope wirelessly with your IOS or Android smartphone or tablet!

It contains a database of over 42,000 celestial objects -- including stars, double stars, galaxies, nebulas, and star clusters -- and intuitive menus that will let you find any of them with just a tap or two of your finger.

Two wide-field 1.25" eyepieces give you low and high power viewing options.

The included 23mm and 10mm wide-field eyepieces provide 78x and 180x magnification, respectively, in the 150mm Mak-Cass optical tube. Each included eyepiece has a wide, 60 apparent field-of-view to show you more of the target objects and its surroundings.

The Orion EZ Finder II reflex sight makes it "EZ" to center alignment stars.

Use the included EZ Finder II reflex sight to help center initial alignment stars when performing the two-star alignment required for accurate GoTo performance. This non-magnifying sighting device superimposes a tiny, LED-powered red dot, focused at infinity, on the sky. After a simple alignment procedure, the red dot shows exactly where your telescope is pointed.

Use the included 90 star diagonal to view the night sky comfortably.

A diagonal "bends" the light path of a telescope so you can enjoy the view without having to contort yourself into awkward positions to peer into the eyepiece. The 90 star diagonal that comes with the StarSeeker IV 150mm GoTo Mak-Cass places the eyepiece you're using in a comfortable position for nighttime stargazing of the skies above.

MoonMap 260

The MoonMap 260 lets you identify craters and other features on the Moon.

Use the MoonMap 260 to locate and identify 260 intersting craters, mountains, "seas" and more on the lunar surface. It will even show you the locations of NASA spacecraft landing sites!

Deep Map

Use the included DeepMap 600 Folding Star Chart to plan deep sky observing adventures!

This "road map" of the cosmos will show you just where to look in the night sky to find interesting objects to explore. Color-coded symbols identify more than 500 of the coolest galaxies, nebulas and star clusters - including all 109 Messier objects - as well as some 100 interesting double and variable stars. DeepMap folds up like a road map for easy packing, and it's printed on durable dew-proof material for worry-free outdoor use.

The StarSeeker IV GoTo mount with its slanted, single-arm altazimuth design provides attached telescopes with 360 of azimuth motion and 90 of altitude motion for horizon-to-zenith pointing. A quick-release narrow dovetail saddle makes telescope attachment nice and easy. The StarSeeker IV 150mm GoTo Mak-Cass Telescope features an upgraded cylindrical leg stainless steel tripod that is much sturdier than previous models and adjusts in height for comfortable use. Tripod stability is further enhanced with the included dual-purpose spreader plate/accessory holder, which keeps the tripod rigid and provides a handy area for stowing idle eyepieces and accessories.

Since the StarSeeker IV 150mm GoTo Mak-Cass Telescope can locate and track celestial objects with its motorized GoTo system, you can use it along with a camera or smartphone to take impressive pictures of the night sky. Capture stunning snapshots of the Moon, planets and more by attaching a dedicated astrophotography camera, or a combination of an Orion SteadyPix accessory and your own point-and-shoot camera or smartphone. (Cameras and SteadyPix accessories sold separately.)

Each StarSeeker IV telescope is powered by 8 internally stored AA batteries (not included). A 12V DC auto-lighter plug is included for use of optional 12V DC field battery. The entire telescope setup weighs 26.1 lbs., so you can take it anywhere that the sky beckons.


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
  • Eyepieces
    3-Element 23.0mm,10.0mm (1.25")
  • Magnification with included eyepieces
    78x, 180x
  • Resolving power
  • Lowest useful magnification
  • Highest useful magnification
  • Highest theoretical magnification
  • Limiting stellar magnitude
  • Optical quality
    Diffraction limited
  • Finder scope
    EZ Finder II
  • Focuser
  • Diagonal degrees
    1.25" 90° Mirror Star
  • Secondary mirror obstruction
  • Secondary mirror obstruction by diameter
  • Secondary mirror obstruction by area
  • Mount type
  • Astro-imaging capability
    Lunar & planetary
  • Computerized compatibility
    Go-To included
  • Alignment procedure
    Two-Star Alignment
  • Number of objects in database
    More than 10,000 deep sky objects
  • Tracking rates
    Sidereal, Solar and Lunar
  • Motor speeds
    Ten different slewing speeds from 0.5x sidereal to over 600x sidereal
  • Power requirement
    8-AA batteries or 12-volt DC
  • Tube material
  • Tripod material
  • Tripod leg diameter
    1.25 in.
  • Length of optical tube
    17.7 in.
  • Weight, optical tube
    12.1 lbs.
  • Weight, fully assembled
    26.1 lbs.
  • Additional included accessories
    2" visual back accepts 2" or 1.25" accessories, Orion DeepMap 600 star chart and MoonMap 260, Front dust cover
  • Other features
    Mount is Wi-Fi enabled for wireless control, Control via smartphone with FREE SynScan Pro app, Internal battery compartment holds 8 AA batteries
  • Warranty
    One year

StarSeeker IV 150mm optical tube assembly
StarSeeker IV GoTo mount and tripod
EZ Finder II reflex sight
23mm wide-field 60 AFOV eyepiece, 1.25"
10mm wide-field 60 AFOV eyepiece, 1.25"
1.25" star diagonal
Accessory tray
12V DC power cable (auto lighter plug to 2.1/5.5mm plug)
Liquid-filled compass
MoonMap 260
DeepMap 600

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: $50.00
3 Day Delivery: $87.00
2 Day Delivery: $87.00
Next Day Delivery: $102.00

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