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Vixen Optics BT81S-A 81mm f/5.9 Binocular Telescope with Pro Accessory Package
Vixen Optics BT81S-A 81mm f/5.9 Binocular Telescope with Pro Accessory Package

Vixen Optics BT81S-A 81mm f/5.9 Binocular Telescope with Pro Accessory Package

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Your Price: CAD4,426.02
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Part Number:14304Pro

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Vixen Optics gives you a complete observational rig with the BT81S-A 81mm f/5.9 Binocular Telescope with Pro Accessory Package. The BT81S-A binocular telescope features achromatic glass lenses combined with anti-reflection fully multi-coated optics that maximize light transmission while virtually eliminating chromatic and spherical aberration. The 81mm objectives and 480mm focal length produce a relatively fast f/5.9 optic for astroimaging or photography utilizing eyepiece imaging systems. Views through the telescope are bright and clear with true color rendition and high-contrast, and objects can be brought into sharp focus without comas or halos.

Two ultra-wide angle 14mm eyepieces, that are included, produce a competent mid-range 24x magnification - ideal for observing the Moon, comets, asteroids, and meteor showers - and are compatible with most 1.25" eyepiece filters to further enhance the view. Each ocular is individually focused for precise pin-point views for every user, and accepts any 1.25" telescope eyepieces for changing the magnification to fit specific observation needs. The binocular is designed with the eyepieces set at a 45° angle to make long observation sessions comfortable whether viewing celestial or terrestrial subjects. Viewing with both eyes open eliminates the fatigue normally associated with holding one eye closed, as with traditional telescopes. Similarly, the angled oculars are more comfortable, especially when the scope is aimed at or near the zenith. With both eyes open, true stereoscopic vision is maintained, providing a rich depth of field rarely experienced during astronomy sessions.

A manual alt-az mount is specifically designed for Vixen binocular telescopes and provides an easy way to find and track near and deep sky objects, or more earth-bound subjects, without excessive shake. Finding your subjects is made faster with the included XY Red Dot Finder that fits on the integrated shoe. Rounding out the platform is an adjustable-height aluminum tripod and a convenient accessory tray. With a minimum height of 25" and a maximum of 39", observers of most sizes can comfortably use this telescope standing up or sitting down.

  • 81mm BT81S-A Astronomical Binocular - OTA

    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
  • SSW 14mm 83° Ultra Wide Eyepiece (1.25")

    This 14mm version of Vixen Optic's SSW 83&Deg; Ultra Wide Eyepiece delivers an immersive observational experience through a combination of optics and coatings that work together to produce bright and clear images across the entire expansive field of view. Its performance starts with a seven-element lens design using high-transmission/low dispersion lanthanum and exotic glass which limits distortion (spherical aberration) and color fringing (chromatic aberration) for edge to edge sharpness with true color rendition. Complementing the glass are proprietary anti-reflection optical coatings which increase contrast and help transmit the light through the system with very little loss.

    Designed with a 1.25" barrel for use with the most popular focusers and accessories, each eyepiece in the series has its own unique color for easy identification at a glance. The color is an anodized finish on the aluminum body so it not only acts as an identifier;it protects the exterior as well. Rounding out the features is a 13mm eye relief, a retractable eyecup, and an hexagonal anti-roll design. The SSW series of eyepieces are made by Vixen in Japan.

    Optical Performance
    • 14mm focal length
    • 83° ultra-wide field of view
    • High-transmission/low dispersion lanthanum and exotic glass
    • Anti-reflection fully multicoated optics for high-contrast images
    Use and Handling
    • Sleeve design for use with compression ring and screw eyepiece adapters
    • Retractable eyecup with rubber grip for great viewing and comfortable handling
    • Eye Relief: 13mm
    Construction Details
    • 1.25" diameter barrel
    • Lightweight aluminum body
    • Scratch and corrosion-resistant anodized finish
    • Color coded: Unique anodized color for each size eyepiece in the series
    • Hexagonal anti-roll design
    • Made in Japan
  • XY Dot Finder

    Vixen Optics designed their XY Dot Finder as a faster alternative to conventional magnified finderscopes. This unmagnified optic puts a red dot in the center of the sighting window that, when properly aligned with your optical tube, allows you to simply cover your target object with it and have it centered in your OTA's eyepiece. This design allows you to see the entire night sky above you for faster scanning and movement versus conventional finderscopes that limit your field of view. With eleven settings, controlled by an easy to use rheostat dial, the dot intensity can be set at the most comfortable brightness so you can see the dot without affecting your night-adjusted vision. This dot finder comes with an aluminum mounting bracket that is compatible with all Vixen OTAs and one CR2032 battery.

  • HF2 Altazimuth Fork Mount

    This HF2 Altazimuth Fork Mount from Vixen is an altazimuth mount that's designed for use with large astronomical binoculars. The fork mount can be fixed to most sturdy tripods with a 3/8"-16 mounting-stud, including Vixen's HAL130-GP and HAL130-SX tripods. To complete the assembly, an appropriate swing bracket must be attached to the binocular.

  • HAL 130SXG Aluminum Tripod

    The HAL 130SXG Aluminum Tripod from Vixen Optics is compatible with Vixen's Sphinx and GP telescope mounts. The adjustable height allows the user to set the position of the telescope to their liking for easy and comfortable viewing. The top of the tripod, where the mount attaches, is powder-coated for a durable finish that resists flaking and fading. The tripod is also collapsible for convenient storage and portability.

  • Triangle Accessory Tray

    This Metal Tripod Tray holds your observing accessories and lock the tripod legs into place.  It fits Vixen and other branded tripods (bolt holes are spaced about 9.5"/241mm apart), including current aluminum tripods for the GP, SP, GP-DX, Sphinx, Porta & Custom-D mounts.

  • 81mm BT81S-A Astronomical Binocular - OTA
    Objective Lens Diameter 81mm
    Interpupillary Adjustment 55.88 - 101.60 mm / 2.2 - 4.0"
    Dioptric Correction None
    Focus Type Individual
    Tripod Mount None
    Dimensions 18.9 x 7.4 x 6" / 48.01 x 18.80 x 15.24  cm
    Weight 9 lb / 4.1 kg
  • SSW 14mm 83° Ultra Wide Eyepiece (1.25")
    Focal Length 14 mm
    Barrel Diameter 1.25"
    Eye Relief 13 mm
    Apparent Field of View 83°
    Dimensions Not specified by manufacturer
    Weight Not specified by manufacturer

    Packaging Info
    Box Dimensions (LxWxH) 4.7 x 2.4 x 2.2"
  • XY Dot Finder
    Magnification 1x
    Battery 1 x CR2032
    Dimensions 4.5 x 4.5 x 1.5" / 11.4 x 11.4 x 3.8 cm
    Weight 9.0 oz / 255.2 g, with battery

    Packaging Info
    Box Dimensions (LxWxH) 12.0 x 8.0 x 5.0"
  • HF2 Altazimuth Fork Mount

    Packaging Info
    Box Dimensions (LxWxH) 15.0 x 15.0 x 5.0"
  • HAL 130SXG Aluminum Tripod
    Height Adjustment Range 25 to 39" (64 to 99 cm)
    Maximum Leg Spread 63.5" (161 cm) Diameter
    Construction Aluminum 2-piece adjustable legs
    Folded Length 32" (81 cm)
    Payload Capacity 77 lb (35 kg)
    Weight 12.1 lb (5.5 kg)
  • Triangle Accessory Tray

    Box Dimensions (LxWxH) 12.598 x 9.449 x 1.732"

In the Box
Bundle Items
81mm BT81S-A Astronomical Binocular - OTA
  • Mount Block
  • Lifetime Transferable Warranty
SSW 14mm 83° Ultra Wide Eyepiece (1.25")
  • Limited 5-Year Warranty
XY Dot Finder
  • 50mm Finder Bracket (Tall)
  • Allen Wrench
  • CR2032 Battery
  • Limited Five-Year Warranty
HF2 Altazimuth Fork Mount
  • Limited 1 Year Warranty
HAL 130SXG Aluminum Tripod
  • Limited 5-Year Warranty
Triangle Accessory Tray
  • 1-Year Warranty

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