Vixen Optics 81mm BT81S-A Astronomical Binocular - OTA

BH #VIBT81S • MFR #14304
Vixen Optics
Vixen Optics 81mm BT81S-A Astronomical Binocular - OTA
Key Features
  • Erect Image Binocular Viewing
  • Aperture of 81mm
  • Focal Length of 480mm
  • 45-Degree Angled
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.

Special Order
Expected availability: 7-14 business days
$999.00

Vixen Optics 81mm BT81S-A Astronomical Binocular - OTA

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Vixen Optics BT81S-A Overview

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

Performance
Objective Lens Diameter81 mm
Interpupillary Adjustment55.9 to 101.6 mm / 2.2 to 4"
Diopter AdjustmentNone
Focus TypeIndividual
General
Dimensions18.9 x 7.4 x 6" / 48.01 x 18.8 x 15.24 cm
Weight9 lb / 4.08 kg
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