Vixen Optics 81mm BT81S-A Astronomical Binocular - OTA

Vixen Optics 81mm BT81S-A Astronomical Binocular - OTA

Vixen Optics 81mm BT81S-A Astronomical Binocular - OTA

B&H # VIBT81S MFR # 14304
Vixen Optics 81mm BT81S-A Astronomical Binocular - OTA

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Expected availability: 7-14 business days

Product Highlights

  • Erect Image Binocular Viewing
  • Aperture of 81mm
  • Focal Length of 480mm
  • 45-Degree Angled
  • Magnesium Fluoride Coated
  • Individual Focus
  • Carry Handle
  • Finder Bracket
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Vixen Optics BT81S-A overview

  • 1Description

The 81mm BT81S-A Astronomical Binocular - OTA from Vixen Optics is an astronomical observation binocular allowing interchangeable eyepieces that provides 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 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 the binocular optical tube assembly (OTA) only. Eyepieces, mount and a tripod or base need to be supplied by the user.

Accepts multiple 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"
Resolving power of 1.43 arc seconds and light gathering value of 134x
Twin 480mm f/5.9 achromatic refractor telescopes with 45° incorporated erect image diagonals

Vixen Optics BT81S-A specs

Objective Lens Diameter 81mm
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 zbbwxqrurwzsewswfeczaueeyzszt

optical assembly only

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