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Orion Telescopes
Orion StarSeeker IV 150mm GoTo Mak-Cass Explorer Kit
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  • Complete GoTo telescope packed with lots of useful extra accessories
  • Powerful 150mm-aperture Maksutov-Cassegrain telescope provides amazing views
  • Computerized GoTo system locates and tracks over 42,000 celestial objects for you to explore
  • Includes GoTo hand controller, 23mm (78x) and 10mm (180x) wide field 60-degree eyepieces, 90-degree diagonal, 2" visual-back, EZ Finder II sight, and more
  • Value-packed Explorer Kit includes a padded telescope case, SteadyPix EZ smartphone adapter, Moon filter, Shorty 2x Barlow, Beginning Stargazer's Toolkit, Planetary Observing Guide Kit, DeepMap 600, MoonMap 260, and more

Learn more
Item #  27302

This deluxe Explorer Kit includes the complete StarSeeker IV 150mm GoTo Maksutov-Cassegrain Telescope and a large assortment of useful extra accessories.

Our biggest Maksutov-Cassegrain StarSeeker IV GoTo telescope combines motorized object-location technology with high-power optical performance at a great price. With its computerized database of over 42,000 celestial objects to explore, this smart GoTo telescope will lead you and your family on a guided tour of the stars on any clear night.

Featuring a compact, yet large-aperture Maksutov-Cassegrain optical tube with an extra-long 1800mm focal length and f/12 focal ratio, the StarSeeker IV 150mm Mak-Cass collects a ton of light with its big 5.9" objective lens for bright views. Thanks to its combination of substantial aperture and long focal length, this telescope yields super-sharp resolution at high magnifications, making it an ideal instrument for high-power views of objects in the night sky. You'll be amazed by the exceptional amount of detail this telescope delivers when observing the Moon's cratered surface, and by its ability to reveal subtle features on planets like Jupiter, Saturn and Mars. Deep-sky objects such as nebulas, star clusters, and brighter galaxies are also well within range of this compact power-performer.

The SynScan GoTo hand controller included with the Orion StarSeeker IV 150mm telescope contains a database of over 42,000 stars and deep sky objects, which you can explore with pushbutton ease. No knowledge of the night sky is necessary! Select from intuitive object menus or try the "Deep Sky Tour" mode to visit a selection of the evening's best objects. Once a desired target is pinpointed, the StarSeeker IV mount's internal motors automatically track it to keep it centered in the eyepiece.

What's more, the StarSeeker IV mount is now Wi-Fi enabled, which allows you to control it wirelessly from your smartphone or tablet instead of the cabled hand controller! Just download the FREE SynScan Pro app to your iOS or Android device to enjoy wireless GoTo control! The app sets up a local Wi-Fi network between your phone and the mount, so no internet connection is needed in the field. Hey, you use your phone for everything else ? why not use it to explore the night sky with your telescope, too?

Buy SynScan Pro App on the App Store

Buy 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 GoTo hand controller. To save time, battery life, and reduce motor wear, you can manually point the telescope towards the general area of a target object, then engage the tube lock and use the hand controller to let the GoTo mount finish the fine-centering of the object electronically.

This complete GoTo telescope setup includes a large assortment of useful extra accessories:

Two wide-field eyepieces

Two wide-field 1.25" eyepieces are included with the StarSeeker IV 150mm GoTo Mak-Cass.

The included 23mm wide-field eyepiece provides 78x magnification in the 150mm Maksutov-Cassegrain optical tube, and the 10mm ocular yields a very high-magnification, 180x view through the telescope for close-up inspections of starry skies. Each included eyepiece has a wide, 60 apparent field-of-view to show you more of the target object and its surroundings.

90 degree star diagonal

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 1.25" 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.

EZ Finder II

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.

Hand controller

Let the computerized GoTo controller guide you on a tour.

The StarSeeker IV 150mm GoTo Mak-Cass lets you explore the skies with pushbutton ease thanks to its GoTo hand controller. With a vast database of over 42,000 celestial objects including stars, double stars, galaxies, nebulas, star clusters, and more, the included computerized GoTo hand controller will become your tour guide to the skies. The built-in "Tour" mode will show you great sights on any clear night.

Moon Filter

Use the Moon Filter that comes with the telescope kit for great lunar views.

Improve your telescopic explorations of the Moon by using the included Orion 13% Transmission Moon Filter. The threaded filter is easy to install on the included 20mm and 10mm eyepieces, and its neutral-density filtration will help enhance contrast of craters, mountains, and other interesting lunar features. The 13% transmission filter also helps reduce the bright glare of the Moon to make observations more comfortable.

Shorty Barlow

Double the magnifying power of 1.25" eyepieces with the included Shorty 2x Barlow.

A 2-power (2x) Barlow lens is a versatile telescope accessory that doubles the magnification of any eyepiece installed. For example, using the included Shorty 2x Barlow with the 23mm eyepiece in the StarSeeker IV 150mm GoTo Mak-Cass Telescope bumps the magnifying power from 78x to 156x. What's more, you can use the compact Shorty 2x Barlow with any other 1.25" eyepieces you already have, or any you purchase in the future.

SteadyPix EZ

Take sharply-focused high-power photos through your scope.

Use this handy adapter to capture smartphone photos of the view in your telescope, so you can share your stargazing experiences via text, email, or social media.


Orion RedBeam Mini LED flashlight

A red flashlight is needed to read materials and illuminate astronomy equipment at night. While a white flashlight would work too, it would decrease your dark-adapted vision at night, making it more difficult to get the most out of your observations. The Orion Redbeam Mini LED keychain flashlight emits pure red light that won't spoil your night vision. Perfect for reading your planisphere or seeing what you're doing at the telescope.

padded case

Padded Telescope Case

The StarSeeker IV 150mm GoTo Mak-Cass Explorer Kit includes a rugged, soft custom case, fully padded on all sides, to provide maximum protection for your telescope. The case provides a convenient means for transporting and storing your telescope. It's made of heavy, water-resistant polyester/nylon material with padding sewn into the inner lining. Comfortable to carry, forgiving of bumps and bruises, and more space-efficient than boxy hard cases.

Deep Map

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

The StarSeeker IV 150mm GoTo Mak-Cass Explorer Kit includes the popular DeepMap 600 folding star chart. This "road map" of the cosmos will tell you just where to look in the night sky to find interesting objects to explore in the powerful StarSeeker IV telescope. Color-coded symbols identify more than 500 galaxies, nebulas, and star clusters ? including all 109 Messier objects ? as well as some 100 of the most interesting double and variable stars. DeepMap folds up just like a road map for easy packing, and it's printed on durable dew-proof material for worry-free outdoor use.

star target

Orion Star Target Planisphere

This handy star-chart wheel makes it easy to see "what's up" in the night sky any day 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. You can even use the Orion Star Target planisphere chart to plan out a stargazing session in the future, or see what time of year your favorite constellation or star will be visible. Designed for use in 30-50 latitudes.

Moon Map

Orion MoonMap 260

The included Orion MoonMap 260 is a useful reference map of the Moon's surface that 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.

Planetary Observing Guide Kit

Planetary Observing Guide Kit

These educational and affordable guides ? the Orion Mars Map and Observing Guide, the Jupiter Map and Observing Guide, and the Saturn Map and Observing Guide ? are perfect for stargazers of all ages and skill sets. Each guide is plastic-laminated for durability, measures 25.25" x 11" when fully unfolded, and folds up to 8.5" x 11" for easy portability.

Telescope Observer's Guide

Telescope Observer's Guide

Use your telescope and the Orion Telescope Observer's Guide to explore over 60 interesting celestial objects! Written by Richard J. Bartlett, this must-have introduction to exploring the sky with a telescope is packed with helpful hints and tips for exploring star clusters, multiple stars, nebulas, and even the Andromeda Galaxy. Useful resources for each object include a map, finder scope view, depiction of what you can expect to see in your telescope eyepiece, and more.

This 150mm GoTo Mak-Cass features a big, 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 StarSeeker IV GoTo mount and 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 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. The entire telescope setup weighs 26.1 lbs. for convenient transportability.

Since the StarSeeker IV 150mm Maksutov-Cassegrain 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 to the StarSeeker IV 150mm Mak-Cass to explore the rewarding hobby of astrophotography. (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 batteries.  



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
  • 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
    Dual encoders on each axis allow manual GoTo, INternet upgradeable hand controller, Internal battery compartment
  • Other features
    2" visual back accepts 2" or 1.25" accessories, Front dust cover, Dovetail mounting rail
  • Warranty
    One year

Orion StarSeeker IV 150mm GoTo Mak-Cass Telescope
Orion SteadyPix EZ Smartphone Telescope Photo Adapter
Orion Shorty 1.25" 2x Barlow Lens
1.25" Orion 13% Transmission Moon Filter
Orion Telescope Observer's Guide
Orion Star Target Planisphere, 30-50 degree
Orion MoonMap 260
Orion RedBeam Mini LED Flashlight
Orion Mars Map and Observing Guide
Orion Jupiter Map and Observing Guide
Orion Saturn Map and Observing Guide
DeepMap 600
MoonMap 260
43"x9"x11" Orion Padded Telescope Case

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: $60.00
3 Day Delivery: $124.00
2 Day Delivery: $124.00
Next Day Delivery: $151.00

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