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Please Note

Orion has made the difficult decision to close our warehouse facility in the Netherlands. With the continuing supply chain/logistics challenges and slowness in the economy we have found that it is not economically feasible to maintain operations in the UK and Europe.

We have therefore stopped taking orders on this website. We apologize for any inconvenience.

We will continue to have Orion dealers in Europe to meet the needs of Orion consumers. We will also continue to honor the 30-Day product return period as well as honoring the Orion warranty for purchases made in the UK and Europe.

Our US-based Customer Service Representatives are here to help. Contact them via email at support@telescope.com or in the United Kingdom, via phone at 0-800-041-8146 (Monday-Friday between the hours of 1300 and 2400 GMT).

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Orion Telescopes
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Orion GiantView BT-100 ED 90-degree Binocular Telescope
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This product is no longer available for purchase.
  • Huge 100mm objective lenses provide incredibly bright and immersive views of starry skies and daytime scenes
  • ED lenses provide the sharpest, highest contrast image possible while minimizing false color (chromatic aberration)
  • Accepts interchangeable 1.25" eyepiece pairs for a variety of magnification options (additional eyepieces sold separately)
  • Included pair of 18mm, 65 eyepieces provide 31x views out of the box
  • Waterproof and nitrogen purged, featuring 90 eyepiece orientation (specifically geared towards comfortable astronomical viewing), and weighs in at 16.8 pounds


Learn more
Item #  51878u

With huge 100mm objective lenses, the Orion GiantView BT-100 ED 90º Binocular Telescope delivers an immersive observing experience. Stargazing or viewing distant terrestrial objects with two eyes provides an amazing amount of depth while also making observations more comfortable. Views of lunar craters to wispy nebulae will take on an almost 3D feel in the GiantView BT-100 ED. The 100mm aperture objective lenses gather 56% more light than 80mm binoculars, so you'll be able to see more objects in the sky with greater clarity. The Extra Low Dispersion lenses (ED) provide the highest quality image, minimizing false color and providing extremely detailed views. And the 90° angle provides the most comfortable viewing angle when aiming high into the night sky.

The GiantView BT-100 ED Binocular Telescope includes a pair of 18mm 65° 1.25" eyepieces which provide 31x magnification and a 2.1° field. Individual eyepiece focusers provide precise focus control, while compression rings hold the eyepieces securely in place.

One of our favorite features of the BT-100 ED is its ability to accept pairs of 1.25" eyepieces so you can control magnification depending on the object (requires two identical 1.25" eyepieces to work). For the best results, we recommend using pairs of 8mm or longer focal length 1.25" eyepieces with the BT-100 ED.

You can also use pairs of 1.25" light pollution filters to significantly improve contrast while observing deep sky objects. With filters installed, the BT-100 ED provides seriously amazing views of many deep sky delicacies.

Thanks to its sealed construction and nitrogen purged body, the rugged BT-100 is waterproof for use in damp conditions, but it's not designed for permanent outdoor placement. The GiantView BT-100 ED weighs 16.8 lbs. and requires a solid mount for stable support. A built-in 1/4"-20 socket allows secure mount or dovetail plate attachment. Includes hard foam-lined carry case. NOTE: Standard camera tripods are not recommended for use with the GiantView BT-100 ED. Includes hard foam-lined carry case.

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 sales-eu@telescope.com

Product Support
Visit our product support section for instruction manuals and more
  • Best for viewing
    Lunar & bright deep sky
  • User level
    Advanced
  • Magnification
    31x
  • Optical diameter
    100mm
  • Field of view - angular
    2.1°
  • Field of view - linear
    112.0m/1000m
  • Apparent field of view
    65.0°
  • Eye relief
    17.0mm
  • Exit pupil
    3.3mm
  • Near focus
    27m
  • Coatings
    Fully multi-coated
  • Prism
    BAK-4 Porro
  • Interpupillary distance range
    55mm - 83mm
  • Focus style
    Individual eyepiece focus
  • Waterproof
    Yes
  • Tripod adaptable
    Yes
  • Diopter adjustment
    Yes
  • Weight
    7.6kg
  • Height
    20.3cm
  • Additional included accessories
    18mm eyepieces (set of two), Carry handle, Eyepiece and objective lens caps
  • Other features
    Nitrogen purged, Interchangeable eyepieces, Waterproof
  • Warranty
    One year

Orders received by 5pm UTC for in-stock items 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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