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Orion Telescopes
Orion GiantView BT-120 90-degree Binocular Telescope
3 easy payments of $933.33
With payment plan
Accepted Payment
Expected Ship Date: 08/23/2024

  • Massive 120mm objective lenses (660mm focal length, f/5.5) provide incredibly bright and detailed correct-image views of the night sky
  • Includes pair of 18mm, 65anddeg; eyepieces to provide 37x magnification out of the box
  • Accepts interchangeable 1.25" eyepiece pairs for a variety of magnification options (additional eyepieces sold separately)
  • Includes dovetail finder base for attaching optional Orion finder scopes to help aid in aiming the binoculars
  • Waterproof and nitrogen purged, featuring 90anddeg; eyepiece orientation (specifically geared towards comfortable astronomical viewing), and include hard shell heavy duty case. Binoculars weighs 20.25 pounds

Learn more
Item #  51866

The Orion GiantView BT-120 90 Binocular Telescope is our largest binocular to date, and delivers an incredibly bright image and immersive field of view. Using two eyes instead of squinting through one eye provides a much more natural observing experience, and with the large 120mm aperture, these binoculars gather 44% more light than our 100mm unit! High resolution optics provide incredible lunar detail, and deep-sky objects take on a life of their own with an almost 3D feel in the GiantView BT-120. And we absolutely love the 90 angle, which provides the most comfortable viewing angle when aiming high into the night sky. And of course, if you have a room with a view of terrestrial vistas, the BT-120 will work equally well for magnifying distant landscapes.

The GiantView BT-120 Binocular Telescope twin objectives have a focal length of 660mm (f/5.5) and include a pair of 18mm 65 1.25" eyepieces which provide 37x magnification and a 1.8 field of view. Individual eyepiece focusers provide precise focus control, while compression rings hold the eyepieces securely in place.

Like our entire line of Binocular Telescopes, one of our favorite features of the BT-120 is the ability to use pairs of 1.25" eyepieces to control the magnification depending on the object in view (requires two identical 1.25" eyepieces to work). 28mm field stops minimizes vignetting with even wide field of view eyepieces. For the best results, we recommend using pairs of 8mm or longer focal length 1.25" eyepieces with the BT-120.

And because you can use standard astronomical 1.25" eyepieces, you can also use pairs of 1.25" light pollution filters to significantly improve contrast while observing deep sky objects. Try a pair of Orion UltraBlock Narrowband filters while looking at something like the Orion Nebula, and you might find it hard to peel your eyes away. In darker locations with the 1.25" Orion O-III nebula filters, the fine tendrils of the Eastern Veil nebula (NGC 6992) spill across the field of view. And of course, Orion SkyGlow Broadband Light Pollution filters work to boost the contrast of all objects when viewed from light polluted skies.

Thanks to the sealed construction and nitrogen purged body, the rugged BT-120 is waterproof for use in damp conditions, but it's not designed for permanent outdoor placement. The GiantView BT-120 weighs 20.25 lbs. and requires a very solid mount for stable support. We've also included a finder scope dovetail shoe to allow attachment of any Orion brand finder to the top handle to aid in aiming at objects in the night sky. A built-in 1/4"-20 socket allows secure mount or dovetail plate attachment. NOTE: Standard camera tripods are not recommended for use with the GiantView BT-120. And to protect your investment, the BT-120 fits into an included heavy duty hard-shell and foam-lined case.


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.

Product Support
Visit our product support section for instruction manuals and more
  • Best for viewing
    Lunar & bright deep sky
  • User level
  • Magnification
  • Optical diameter
  • Field of view - angular
  • Field of view - linear
    93.0 ft./1000 yd
  • Apparent field of view
  • Eye relief
  • Exit pupil
  • Near focus
    82 ft.
  • Coatings
    Fully multi-coated
  • Prism
    BAK-4 Porro
  • Interpupillary distance range
    54mm - 76mm
  • Focus style
    Individual eyepiece focus
  • Waterproof
  • Tripod adaptable
  • Diopter adjustment
  • Weight
    20.3 lbs.
  • Height
    8.0 in.
  • Additional included accessories
    18mm eyepieces (set of two), Hard shell foam lined case, Finder scope dovetail shoe
  • Other features
    Nitrogen purged, Interchangeable eyepieces, Waterproof
  • Warranty
    One year

Orion GiantView BT-120 Binocular Telescope
Hard carrying case
18mm UF eyepieces (qty 2)
Finder scope dovetail shoe
Objective lens caps
Eyepiece lens caps
1.25" focuser covers

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: $100.00
2 Day Delivery: $100.00
Next Day Delivery: $200.00

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