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Vixen Optics 81mm BT81S-A Astronomical Binocular - OTA

B&H # VIBT81S Mfr # 14304
Usually ships in 7-14 business days

Availability Details

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This is a Special order item. Est. arrival at B&H is 7-14 business days (subject to availability). Your order will be charged at time of shipment.
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International orders will be charged when the order is placed.

Free Standard Shipping
Not eligible for free Expedited Shipping
You Pay: $999.00
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

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
Objective Lens Diameter 81 mm
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 / 4.08 kg 1
Please Note:

optical assembly only

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Vixen Optics 81mm BT81S-A Astronomical Binocular - OTA
  • Mount Block
  • Lifetime Transferable Warranty
  • Eyepieces, Doublers, Finderscopes

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    Required item: Required item: Two eyepieces are required but not included with this binocular.

    Vixen Optics -  4mm NPL Plossl Eyepiece (1.25")
    • You Pay: $39.95
    Usually ships in 7-14 business days i This is a Special order item. Est. arrival at B&H is 7-14 business days (subject to availability). Your order will be charged at time of shipment.
     

    Straps & Harnesses

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    Strap your device securely & carry in comfort.

    OP/TECH USA -  Bino/Cam Harness (Elastic Version)
    • You Pay: $19.95
     

    Tripod Adapters

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    Make your binocular tripod ready for prolonged observation.

    Walkstool -  Comfort 45 Large Folding Stool
    • You Pay: $74.95
     

    Height 11 and 18"

    Tripods and Window Mounts

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    Steady your binocular with the support and stability you need.

    Magnus -  VT-4000 Tripod System with Fluid Head
    • You Pay: $149.95
     

    Cleaning & Anti-Fog

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    Help keep your optics clean & fog free with these tools.

    Pearstone -  Microfiber Cleaning Cloth, 18% Gray (7 x 7.9")
    • You Pay: $4.99
     

    Rugged Scoping Accessories

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    Enhance your glassing or trekking sessions with these useful tools.

    Brunton -  9077 Lensatic Sighting Compass
    • You Pay: $6.48
     

    Digiscoping with Binoculars

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    Capture photos with your i phone through the eyepiece of your binoculars.

    Meopta -  MeoPix iScoping Adapter for iPhone 5 (44mm)
    • You Pay: $59.99
     

    On Location Tools

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    High-quality tools and flashlights always come in handy.

    Fenix Flashlight -  E01 LED Flashlight (Black)
    • You Pay: $8.99
     
    View all Accessories
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