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

B&H # VIBT81SAS MFR # 14304PRO
Vixen Optics BT81S-A 81mm f/5.9 Binocular Telescope with Pro Accessory Package

Show MoreLess


Now Viewing:

In Stock

Product Highlights

  • 81mm f/5.9 Lens System
  • Achromatic Fully Multi-Coated Optics
  • Two 83° Wide-Angle 14mm Eyepieces
  • Integrated Handle and Finderscope Shoe
  • Erect-Image Viewing
  • Manual Alt-Az Fork Mount
  • HAL130 Aluminum Tripod with Tray
  • Adjustable Height from 25 to 39"
  • 77 lb Payload Capacity
  • XY Red Dot Finder
Show moreShow less

Options: Mount/Tripod/Pro Acc'y Package

Mount/Tripod/Acc'y Package

Back-Ordered - Special Order

Mount/Tripod/Pro Acc'y Package Optic Only

Special Order

Aperture: 81mm



81mm 126mm

B&H $500 Gift Card Dash

Share for a chance to win a $500 B&H Gift Card!

Share on Twitter

Share a favorite product for chances to win one of eight $500 B&H Gift Cards!
1 new winner announced every Monday starting Nov 5th!
Limit 1 entry per day: Come back every day to increase your chance of winning.

Be sure to mention #BHWishList when you share!

Congrats to our winners so far:

Next winner: Dec 17th

James Z. (Wk 1)

Ralph H. (Wk 2)

Arturo M. (Wk 3)

Rich P. (Wk 4)

Valeria A. (Wk 5)

Sabrina B. (Wk 6)

Official Rules


NO PURCHASE IS NECESSARY TO ENTER OR WIN. The B&H $500.00 Gift Card Dash (the "Sweepstakes") is void where prohibited by law and is sponsored by B&H Foto & Electronics Corp., 440 Ninth Avenue, New York, NY 10001 ("Sponsor"). It is not sponsored or endorsed by Facebook or Twitter in any way.

Entry Period/Methods of Entry. The Sweepstakes will run from on or about October 28, 2018 until on or about December 23, 2018 (the "Entry Period"). Entries received outside the Entry Period are void. Enter the Sweepstakes via either one of the following methods. (1) Share any product found on the B&H website (the "Website") on Facebook or Twitter via the dedicated links contained on the website using the hashtag #BHWishlist; or (2) Mail a postcard (postmarked during the Entry Period) containing your name, address, phone number, and email address, and indicate the subject(s), if any, about which you are interested in receiving future emails from B&H (e.g. photo, video, audio, computers, home theater, portable entertainment ) (optional) to: B&H $500.00 Gift Card Dash Sweepstakes, c/o B&H Foto & Electronics Corp., 440 Ninth Avenue, New York, NY 10001 (either option, an "Entry"). Entries must not, in the sole and absolute discretion of the Sponsor, contain obscene, provocative, defamatory, sexually explicit, or otherwise objectionable or inappropriate content. Entries deemed by Sponsor to be inappropriate will be disqualified. Entries owned by a third party, or the use of any trademarks, service marks, logos, brands, or products owned by a third party are not acceptable for entry into the Sweepstakes. Limit 1 entry per person, per day.

Winner Selection/Prizes/Odds. The B&H Social Team will randomly select a winner from among all eligible entries every Monday during the Entry Period, for a total eight (8) winners (each a "Winner"). Each Winner will receive a B&H Gift Card pre-valued in the amount of $500.00. No cash or other substitutions will be offered. Winner selection is in the sole and absolute discretion of the B&H Social Team. Any taxes are the sole responsibility of the winner. Winners will be notified and receive their prize at the email address associated with the account to which their Entry was posted or the email account provided with a mail-in entry. The odds of winning depend on the number of eligible entries received.

Identity of Winners/Eligible Participants. Winners will be identified by the email account associated with the Facebook or Twitter account from which their Entry was submitted or the email account provided with a mail-in entry. An email account holder shall mean the natural person assigned to such email account by the internet access or online service provider or other organization responsible for assigning email addresses for the domain associated with such email account. Any issues regarding the identity of a Winner shall be resolved by Sponsor in its sole discretion. The Sweepstakes is only open to residents of the United States that are at least eighteen (18) years of age on their entry date and is not open to employees of Sponsor, their immediate family, any person domiciled with such employees, or any affiliates or subsidiaries of Sponsor.

Entry Ownership/Entrant Agreements. Entrants retain full ownership and copyrights to their Submission. However, by entering the Sweepstakes entrants grant Sponsor permission to use their Entries for promotional purposes on their respective social media channels with proper credit. Entrants also agree: (a) to be bound by these Official B&H $500.00 Gift Card Dash Sweepstakes Rules; (b) that any claims related to this Sweepstakes shall be resolved individually without resort to any form of class action and that awards, shall be limited to actual out-of-pocket costs incurred in entering the Sweepstakes, and shall not include incidental or consequential damages or attorneys fees; and (c) that any actual or perceived ambiguities in these rules shall be interpreted by Sponsor in their sole discretion.

Limitation of Liability/Sponsor Modification/Cancellation Rights/ Choice of Law/ Venue/ Winners List. Sponsor is not responsible for incomplete entries or for failure to receive entries due to technical failures or human error of any kind. Winners agree that Sponsor will have no responsibility for losses or damage of any kind resulting from the acceptance, possession, or use of the prizes. Except where prohibited, participation in the Sweepstakes constitutes entrant's consent to the publication of his or her name by Sponsor in any media for commercial or promotional purposes without limitation or further compensation subject to Sponsor's respective Privacy Policies. Sponsor may modify or discontinue the Sweepstakes at any time and may disqualify from the Sweepstakes any person it determines, in its sole discretion, to have attempted to or actually tampered with or otherwise abused any aspect of the Sweepstakes. Entrants agree that in the unlikely event a dispute arises in connection with this Sweepstakes, it will be governed by the laws of the State of New York and heard exclusively in a court of applicable jurisdiction in the County and State of New York irrespective of any choice of law provisions to the contrary. To receive names of the winners by U.S. mail, please mail a self-addressed stamped envelope to: B&H Foto & Electronics Corp., Attn: B&H $500.00 Gift Card Dash Sweepstakes, 440 Ninth Avenue, New York, NY 10001. Any Winners List request must be received by B&H within one (1) year of the date the Sweepstakes is conducted.

Let us know how to reach you if you win!

Privacy 100% guaranteed; email address for contact purposes only


Already have a B&H account? Just log in tomorrow to enter again!

$0 VA Sales Tax Collected on This Item
Add to Wish List Item in Wish List

Vixen Optics BT81S-A overview

  • 1Description

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 81 mm
    Interpupillary Adjustment 8.7 to 15.7 mm / 0.3 to .6"
    Dioptric Correction None
    Focus Type Individual
    Tripod Mount None
    Dimensions 18.9 x 7.4 x 6.0" / 48.0 x 18.8 x 15.2 cm
    Weight 9.0 lb / 4.1 kg

    optical assembly only

  • 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) 6.0 x 6.0 x 1.0"
  • HF2 Altazimuth Fork Mount
    Packaging Info
    Box Dimensions (LxWxH) 15.95 x 15.4 x 5.85"
  • 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
    Packaging Info
    Box Dimensions (LxWxH) 12.598 x 9.449 x 1.732"

Vixen Optics BT81S-A reviews

Be the first to review this item

Vixen Optics BT81S-A Q&A

Vixen Optics BT81S-A accessories

See any errors on this page? Let us know. xzyesueszuywttttxxfwbvurqffbx