Vixen BT81S-A 25x81 Astronomical Binocular, 19.5mm Eye Relief, 480mm Focal length, 3.24 mm Exit Pupil Diameter

SKU: VX14304P2 MFR: 14304P2
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About the Vixen BT81S-A

The Vixen Optics BT81S-A Astronomical Binocular is an astronomical observation binocular with interchangeable eyepieces providing exceptional terrestrial or celestial observing. The twin 480mm f/5.9 achromatic refractors have permanently attached 45deg. diagonals. They accept the entire lineup of Vixen Optics NPL Plossl eyepieces and have an enormous 56-101mm interpupillary adjustment range to work with nearly any set of eyes, including many children's.

For remarkable depth perception and contrast, there is nothing that beats the ease and comfort of erect image binocular viewing. Expect high quality observing of terrestrial vistas and celestial views alike, in a package which is easily transported to your favorite dark sky location out and beyond.

This permutation of the BT81S-A arrives complete with two NPL Plossl 25mm eyepieces. The eyepieces are fully multicoated with pop-up eyecups. A full size, stable and sturdy aluminum Vixen Optics HAL130-SX tripod is included as is a swing arm and fork mount presenting a full astronomical package ready to peruse the celestial seas.

Vixen BT81S-A Includes

  • Vixen Optics BT81S-A Astronomical Binocular
  • 2 x NPL Plossl 25mm Eyepiece (1.25")
  • HAL130-SX Aluminum Tripod
  • Swing Arm
  • Fork Mount
  • Carry Handle
  • Finder Bracket
  • Vixen Optics Warranty

Vixen BT81S-A Features

  • Twin 480 mm f/5.9 achromatic refractor telescopes with 45deg. incorporated erect image diagonals
  • AAoV of 50deg
  • Interpupillary distance adjustment range of 2.2-4.0"
  • Built-in carry handle and finder bracket
  • Dovetail bar mount block for SX/GP tripods
  • Accepts multiple 1.25" eyepieces
  • Visual back 31.7 mm - friction fit

Vixen BT81S-A Specifications

Magnification 25x
Objective Lens Diameter 81 mm
Angle of View 2.0deg.
Field-of-View 105' at 1000 yd / 34.86 m at 1000 m
Exit Pupil Diameter 3.24mm
Eye Relief 19.5mm
Interpupillary Adjustment 55.88 - 101.60 mm / 2.2 - 4.0"
Dioptric Correction No
Focus Type Individual
Tripod Mount Yes (Adapter Included)
Dimensions 18.9x7.4x6" / 48x18.79x15.24cm
Weight 9lbs / 4.08kg
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