Orion GiantView BT-100 Binocular Telescope

• Huge 100mm objective lenses provide incredibly bright and immersive views of starry skies and daytime scenes
• Included pair of 18mm, 65-degree eyepieces provide 31x views out of the box
• Accepts interchangeable 1.25" eyepiece pairs for a variety of magnification options (additional eyepieces sold separately)
• Features comfortable 45-degree eyepiece orientation and individual eyepiece focusers
• Weighs 14.5 pounds

With two huge 100mm objective lenses, the Orion GiantView BT-100 delivers an immersive observing experience unlike any other. 

Stargazing with both eyes brings an amazing amount of depth to each view while also making observations more relaxing and comfortable. Views of everything from lunar craters to wispy nebulae will take on an almost 3-dimensional feel in the GiantView BT-100 Binocular Telescope. This impressive instrument's 100mm (3.9") aperture objective lenses gather over 56% more light than large 80mm astronomy binoculars, so you'll be able to see more objects in the sky with greater clarity. But the fun doesn't stop at sunrise! During the day, this big binocular telescope becomes the ultimate "spotting scope" for terrestrial exploration. Set the BT-100 up on your deck or at your favorite scenic overlook to enjoy awesome long-distance views. The 45° angle eyepiece holders make both daytime and nighttime observations comfortable.

The GiantView BT-100 Binocular Telescope includes a pair of 18mm 65° flat-field 1.25" eyepieces which provide 31x magnification and a 2.13° field-of-view right out of the box. The included eyepieces are threaded for use with like-sized filters which can be used to enhance observations (eyepiece filters sold separately). Individual eyepiece focusers provide precise focus control, while compression rings hold inserted eyepieces securely in-place.

One of our favorite features of the BT-100 is its ability to accept pairs of interchangeable 1.25" eyepieces so you can control magnification depending on your observing goals (requires two 1.25" eyepieces of the same focal length and optical design, sold separately). For example, a pair of 10mm eyepieces will deliver a 55-power view through the 550mm focal length BT-100 (550/10 = 55). For the best results, we recommend using pairs of 6mm or longer focal length 1.25" eyepieces with the GiantView BT-100.

Since the GiantView BT-100 accepts 1.25" eyepieces, you can also use pairs of 1.25" light pollution filters to significantly improve contrast while observing nebulas and other interesting deep sky objects. With optional light pollution filters installed, the GiantView BT-100 provides seriously amazing views of the Orion Nebula and many more deep sky delicacies. (UltraBlock and SkyGlow light pollution filters sold separately.)

Thanks to its sealed construction, the rugged BT-100 is waterproof for use in damp conditions, but it's not designed for permanent outdoor installation. Bring these big binos inside after each viewing session to keep them in tip-top condition for peak performance year after year.

The big GiantView BT-100 Binocular Telescope weighs in at 14.5 lbs. and requires a sturdy binocular mount for stable support. A built-in threaded 1/4"-20 socket allows secure mount or dovetail plate attachment. NOTE: Standard field tripods are not recommended for use with the GiantView BT-100.

Limited Warranty against defects in materials or workmanship for one year from date of purchase

• Best for viewing

  Lunar & bright deep sky

   
• Magnification

  31x

   
• Optical diameter

  100mm

   
• Field of view - angular

  2.1°

   
• Field of view - linear

  111.7 ft./1000 yd

   
• Apparent field of view

  65.0°

   
• Eye relief

  17.0mm

   
• Exit pupil

  3.2mm

   
• Near focus

  80 ft.

   
• Coatings

  Fully multi-coated

   
• Prism

  BAK-4 Porro

   
• Interpupillary distance range

  54mm - 76mm

   
• Focus style

  Individual eyepiece focus

   
• Waterproof

  Yes

   
• Tripod adaptable

  Yes

   
• Diopter adjustment

  Yes

   
• Weight

  14.5 lbs.

   
• Additional included accessories

  Two 18mm Ultra Flat Field eyepieces, Dust caps

   
• Other features

  45 degree eyepiece angle, Interchangeable 1.25" eyepieces, Compression lock focuser

   
• Warranty

  One year

   

  Orion GiantView BT-100 Binocular Telescope
  Two 18mm wide-angle 65° eyepieces, 1.25"
  Objective lens caps
  Eyepiece lens caps
  Internal focuser plugs