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Orion Telescopes

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Orion Sirius ED102T CF EQ-G GoTo Triplet Refractor Telescope
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  • This high-performance 102mm triplet apochromatic refractor telescope packaged with a precise Sirius EQ-G GoTo mount is sure to please any astronomy enthusiast
  • Tremendously versatile setup capable of excellent results in both visual and astrophotographic applications
  • 102mm aperture apochromatic triplet refractor with a beautiful and thermally stable carbon fiber tube provides peak performance
  • Our popular Sirius EQ-G mount provides a rock-solid foundation and a GoTo database of 42,000+ celestial objects to explore and/or photograph
  • Includes the Orion ED102T CF refractor telescope, Orion Sirius EQ-G computerized GoTo mount and tripod, Starry Night astronomy software, and more!


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Item #  24436

Another winning combination offered by Orion – the Sirius ED102T CF EQ-G GoTo Triplet Refractor will astound any amateur astronomer or astrophotographer. Whether you’re looking for a sweet rig to use for stunning visual observations, or an awesome astrophotography setup, this telescope and mount combo gives you the building blocks to do it all in style! In fact, this is perhaps the ultimate package for anyone looking for a telescope system that can be used to achieve great results for BOTH imaging and visual use. 

Let’s start by looking at the telescope. Our gorgeous Orion ED102T CF refractor is a state-of-the-art instrument featuring superb triplet apochromatic optics in a beautiful carbon fiber tube. The 3-element air-spaced objective uses esteemed FPL-53 extra-low dispersion glass for true-color performance and clear, tack-sharp views. Your images and views alike will be of the highest quality. Its f/7 focal ratio and 102mm aperture make it a very versatile telescope, able to perform admirably on a wide variety of celestial objects. The huge 3” Crayford focuser can easily support large format imaging cameras without vignetting, even when using astrophotography cameras with sensors larger than 35mm. The machined focuser is equipped with precise dual-speed (11:1) adjustment knobs for pleasing visual or astrophotographic performance, and can be rotated relative to the optical tube. Knife-edge baffles in the telescope maximize image contrast, and the strong yet lightweight carbon fiber tube minimizes thermal expansion during long variable-temperature imaging sessions so your camera or eyepiece remains focused. The ED102T CF refractor's carbon fiber dew shield can be retracted for transport and storage, and a handy thumbscrew lock keeps it positioned right where you want it. Hinged tube rings and a dovetail mounting plate are included as well as a thread-on objective dust cap. The optical tube accepts the standard Orion dovetail mounting base (sold separately) if you wish to attach a finder scope.

Now let’s talk about the GoTo mount that’s included. The Sirius EQ-G has become a fan-favorite mount amongst amateur astronomers thanks to its precise performance, convenient portability, and substantial payload capabilities. Internal dual-axis stepper motors offer meticulous tracking of celestial objects for great astrophotographic performance. The GoTo system allows you to select from among 42,900 celestial objects to explore visually or capture photographically using the intuitive menus on the hand controller. You can even take a tour of the finest celestial showpieces to see what objects you’d like to explore in more detail or photograph. Weighing in at just 32 lbs. (43 lbs. including counterweight)this is one pleasantly portable GoTo mount that can be taken just about anywhere dark skies beckon with minimal fuss. The Sirius EQ-G GoTo Mount’s 30 lb. load capacity is easily capable of holding the ED102T CF refractor along with a host of astrophotography accessories or visual-use gear. The Orion Sirius Mount includes an illuminated polar-axis telescope, and one 11-lb. counterweight. The included tripod is remarkably sturdy, as evidenced by the 1.75"-diameter stainless steel legs and cast-metal spreader plate.

So whether you’re looking for a visual observer’s dream setup, or an astrophotographic power performer, or a great combination capable of achieving great results in BOTH visual and astrophotographic  pursuits, pick up the Orion Sirius ED102T CF GoTo Triplet Refractor today!  

Weighs 54.8 lbs. assembled. GoTo system operation requires a 12-volt DC power source or AC-to-DC adapter.

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 800-676-1343.

Product Support
Visit our product support section for instruction manuals and more
  • Best for viewing
    Lunar & planetary
  • Best for imaging
    Deep sky
  • User level
    Advanced
  • Optical design
    Refractor
  • Optical diameter
    102mm
  • Focal length
    714mm
  • Focal ratio
    f/7.0
  • Coatings
    Fully multi-coated
  • Optics type
    Air-spaced triplet
  • Glass material
    Extra low dispersion FPL-53
  • Resolving power
    1.14arc*sec
  • Lowest useful magnification
    14x
  • Highest useful magnification
    204x
  • Highest theoretical magnification
    204x
  • Limiting stellar magnitude
    12.7
  • Optical quality
    Diffraction limited
  • Finder scope
    5x24
  • Focuser
    3" dual-speed rotatable Crayford
  • Mount type
    Equatorial
  • Astro-imaging capability
    Lunar, planetary & long exposure
  • Dovetail bar system
    Yes
  • Motor drive compatibility
    Clock drive included
  • Computerized compatibility
    Go-To included
  • Number of objects in database
    42,000+
  • Tracking rates
    Sidereal, Solar and Lunar
  • Motor speeds
    3.4°/sec, 600x, 500x, 400x, 64x, 32x, 16x, 8x, 2x, 1.75x, 1.5x, 1.25x
  • Bearing material
    Sealed ball bearings
  • Power requirement
    12-volt DC - 2A (tip positive)
  • PEC
    Yes
  • GPS
    Sold separately
  • Backlash compensation
    Yes
  • Setting circles
    Yes
  • Polar-axis scope
    Included
  • Available ports
    RS-232, autoguider
  • Tube material
    Carbon graphite
  • Tripod material
    Steel
  • Tripod leg diameter
    1.75 in.
  • Counterweight bar length
    8 in.
  • Diameter of counterweight shaft
    18mm
  • Height range of mount
    42.00 in. - 55.00 in.
  • Length of optical tube
    27.0 in.
  • Weight, optical tube
    11.8 lbs.
  • Weight, mount/tripod
    43.0 lbs.
  • Weight, fully assembled
    54.8 lbs.
  • Additional included accessories
    Deluxe tube rings, Dovetail plate (Vixen format)
  • Other features
    Retractable dew shield, Interior knife-edge baffled, Microstep driven stepper motors
  • Warranty
    One year

Orion ED102T CF Apochromatic Triplet Refractor Telescope
Orion Sirius EQ-G GoTo Equatorial Mount and Tripod
Computerized GoTo hand controller
Tube Rings
Dovetail tube ring mounting bar
Starry Night SE software

Orders received by noon Pacific Time for in-stock item 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.

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