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Vixen BT81S-A, 81mm Astronomical Observation Binocular With Eyepieces.

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Vixen BT81S-A: Picture 1 regular

About the Vixen BT81S-A

Magnesium Fluoride coated, air space doublet design, dramatically reduces chromatic aberration for magnificent views. This large aperture, 81mm binocular, delivers crisp, clear images. user is provided with the sharpest images possible.

Vixen BT81S-A Includes

  • Vixen Optics BT81S-A, 81mm Binocular
  • With Eyepieces.

Vixen BT81S-A Features

  • Twin 900mm f/11.2 achromatic refractor telescopes with 45° incorporated erect image diagonals
  • Interpupillary distance adjustment range of 56-76mm
  • Built-in handle and dovetail (for use with Vixen telescope mounts)
  • Accepts multiple 1.25" eyepieces including Vixen's LV and LVW models

Vixen BT81S-A Specifications

Prism Type Porro
Magnification 36x (changes with eyepieces being used) [900/eyepiece focal length = magnification]
Objective Diameter 80mm
Angle of View 1.1°
Field-of-View (@ 1000 Yds) 57' (19 m at 1000 m)
Exit Pupil Diameter 2.2mm (changes with eyepieces used)
Eye Relief 22mm (changes with eyepieces used)
Relative Brightness 4.9
Twilight Factor 53.7
Focus Type Individual
Tripod Socket Yes
Dimensions 7.5 x 22.8 x 8.5" (19.0 x 58.0 x 21.5 cm) WxHxD
Weight 11.02 lb (5000 g)
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