Vixen Optics 25x81 BT81S-A Astronomical Binocular with 20mm SLV Eyepieces

Vixen Optics 25x81 BT81S-A Astronomical Binocular with 20mm SLV Eyepieces

Vixen Optics 25x81 BT81S-A Astronomical Binocular with 20mm SLV Eyepieces

B&H # VIBT81SEP MFR # 14304P1
Special Order
Expected availability: 3-7 business days

Product Highlights

  • Erect Image Binocular
  • 45-Degree Angled Viewing
  • Magnesium Fluoride Coated
  • 2.0° Angle of View
  • Two 20mm SLV-Series 1.25" Eyepieces
  • Individual Focus
  • Carry Handle
  • Finder Bracket
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Aperture: 81mm

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Not available with current selections

81mm 126mm

Not available with current selections

$0.00 Tax Collected Outside NY and NJ

Price:  $1,450.00

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Vixen Optics BT81S-A overview

  • 1Description

The 25x81 BT81S-A Astronomical Binocular from Vixen Optics features interchangeable eyepieces that provide exceptional terrestrial or celestial observing. The twin 480mm f/5.9 achromatic refractors have permanently attached 45° diagonals and accept any 1.25" eyepieces. With a broad 56-101mm interpupillary adjustment range this powerful optic will fit 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 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 with two Vixen 20mm SLV-series eyepieces. The eyepieces are fully multicoated, with long eye relief and twist-up eyecups. A required mount and a tripod or base need to be supplied by the user.

Apparent angle of view: 50°
Accepts any 1.25" eyepieces
Visual back 31.7 mm - friction fit
Built-in carry handle and finder bracket
Mount block dovetail bar for SX/GP tripods
Interpupillary distance adjustment range of 2.2-4.0"
Two fully multicoated Vixen 20mm SLV-series eyepieces with pop-up eyecups
Twin 480 mm f/5.9 achromatic refractor telescopes with 45° incorporated erect image diagonals

Vixen Optics BT81S-A specs

Magnification 25x
Objective Lens Diameter 81mm
Angle of View 2.0° (actual)
Field of View 105.0' @ 1000 yd / 35.0 m @ 1000 m
Minimum Focus Distance Not specified by manufacturer
Exit Pupil Diameter 3.24 mm
Eye Relief 19.5 mm
Interpupillary Adjustment 8.7 - 15.7 mm / 22.0 - 40.0"
Dioptric Correction None
Focus Type Individual
Tripod Mount None
Dimensions 18.9 x 7.4 x 6.0" / 48.0 x 18.8 x 15.2 cm
Weight 9 lb / 4.1 kg

optical assembly only

Packaging Info
Package Weight 15.0 lb
Box Dimensions (LxWxH) 29.0 x 13.0 x 12.0"

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