Vixen Optics 25x81 BT81S-A Astronomical Binoculars

BH #VIBT81T • MFR #14304P2
Vixen Optics
Vixen Optics 25x81 BT81S-A Astronomical Binoculars
Key Features
  • 45-Degree Angled Viewing
  • Magnesium Fluoride Coated
  • 2.0° Angle of View
  • NPL Plossl 25mm 1.25" Eyepieces
The 25x81 BT81S-A Astronomical Binoculars from Vixen Optics are astronomical observation binoculars 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.
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Vixen Optics BT81S-A Overview

The 25x81 BT81S-A Astronomical Binoculars from Vixen Optics are astronomical observation binoculars 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 upright-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
UPC: 811971015692

Vixen Optics BT81S-A Specs

Performance
Magnification25x
Objective Lens Diameter81 mm
Angle of View2° (Actual)
Field of View105' @ 1000 yd / 35 m @ 1000 m
Exit Pupil Diameter3.24 mm
Eye Relief19.5 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 x 18.8 x 15.2 cm
Weight9 lb / 4.1 kg
Packaging Info
Package Weight45 lb
Box Dimensions (LxWxH)39 x 25 x 24"
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is the image in the eyepiece inverted, or can i ...

is the image in the eyepiece inverted, or can i use these for terrestrial viewing?
Asked by: Wesley
No the image is not inverted because the Vixen Optics 25x81 BT81S-A is an Astronomical binocular not a telescope.
Answered by: John
Date published: 2019-06-06
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