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Vixen BT-81S-A Astronomy Binoculars

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Delivery 4-9 days
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Email us a question about this ProductVixen

Vixen BT-81S-A Larcge Astronomy Binoculars are made in Japan:

  • Binoculars with 81 mm lens diameter
  • 31.7 mm (1.25 inch) eyepiece sockets for changeable eyepieces
  • Very high light intensity thanks to the large 80 mm lenses
  • Dimensions: 480 x 190 x 155 mm / weight: 4,1 kg
  • Included: binoculars, carry handle, viewfinder, dew caps

Take a look through the new Vixen BT-81S-A Larcge Astronomy Binoculars. You will be impressed when you use them to observe gas nebula, star clusters or comets. This 81mm astronomy binocular delivers crystal clear, sharp views through its new optical design. Its lightweight body ensures that you can take it to any observing location.

The magnesium fluoride coating reduces chromatic aberration and the large aperture of 81 mm ensures a razor-sharp, contrast-rich image.

The BT-81S-A binocular telescope set weighs 4.1 kg, is portable and also exceptionally suited for nature observations. 


  • Objective lenses: 81 mm 2-lens achromat, multi-coated
  • Focal length: 480 mm (f5.9)
  • Resolution and limiting magnitude: 1.43 arc seconds; 11.3
  • Light-gathering power: 134x
  • Dimensions and weight: 480 x 190 x 155 mm; 4.1 kg
  • Adapter and connections: 31.7 mm sockets


  • Binoculars 80 mm
  • Carry handle
  • Viewfinder
  • Dew caps

Specifications: Vixen BT-81S-A Astronomy Binoculars

Technical Data

Field of application
  • Astronomy
  • Night
  • Bird watching & Nature observation
Focus Group
  • Advanced Amateurs
  • Visual enthusiasts
Product Family Refractor telescope
Type Giant Binoculars
Optical design Achromatic Refractor
Angular resolution 1.43 arc seconds
Material prismn Glass
Type of coating Fully multi-coated
Colour of coating blue
Number of lenses 2
Diopter setting
Tripod adapter thread
Single eye adjustment
Colour white
Body material Aluminium
Dust protection caps Dust protection caps for front lens and eyepiece holder
Total length 480 mm
Total width 190 mm
Total height 155 mm
Net weight (without access.) 4000 g

What's in the Box

What's in the Box: Vixen BT-81S-A Astronomy Binoculars

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