Vixen Optics 25x81 BT81S-A Astronomical Binocular

Vixen Optics 25x81 BT81S-A Astronomical Binocular

Vixen Optics 25x81 BT81S-A Astronomical Binocular

B&H # VIBT81T MFR # 14304P2
Vixen Optics 25x81 BT81S-A Astronomical Binocular

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Product Highlights

  • 45-Degree Angled Viewing
  • Magnesium Fluoride Coated
  • 2.0° Angle of View
  • NPL Plossl 25mm 1.25" Eyepieces
  • HAL130-SX Tripod
  • Swing Arm and Fork Mount
  • Individual Focus
  • Carry Handle
  • Finder Bracket
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Options: Mount/Tripod/Acc'y Package

Eyepiece Package

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Mount/Tripod/Acc'y Package Mount/Tripod/Pro Acc'y Package

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Optic Only

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Aperture: 81mm

70mm

Not available with current selections

81mm 126mm
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  • 1Description

The 25x81 BT81S-A Astronomical Binocular from Vixen Optics 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 45° diagonals. They accept the entire lineup of Vixen 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. Take a drive to nowhere on a clear, new moon lit night and be awe struck! The Pleiades and the Moon's terminator never looked like this.

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.

Twin 480 mm f/5.9 achromatic refractor telescopes with 45° incorporated erect image diagonals
AAoV of 50°
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
Magnification 25x
Objective Lens Diameter 81mm
Angle of View 2.0° (actual)
Field-of-View 105' @ 1000 yd / 34.86 m @ 1000 m
Minimum Focus Distance Not Specified By Manufacturer
Exit Pupil Diameter 3.24  mm
Eye Relief 19.5  mm
Interpupillary Adjustment 55.88 - 101.60 mm / 2.2 - 4.0"
Dioptric Correction None
Focus Type Individual
Tripod Mount Yes (Adapter Included)
Dimensions 18.9 x 7.4 x 6" / 48.01 x 18.80 x 15.24  cm
Weight 9 lb / 4.08 kg

optical assembly only

Packaging Info
Package Weight 1.0 lb
Box Dimensions (LxWxH) 39.0 x 19.0 x 8.5"

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