{"closeOnBackgroundClick":true,"bindings":{"bind0":{"fn":"function(){$.fnProxy(arguments,\'#headerOverlay\',,\'\');}","type":"quicklookselected","element":".ql-thumbnail .Quicklook .trigger"}},"effectOnShowSpeed":"1200","dragByBody":false,"dragByHandle":true,"effectOnHide":"fade","effectOnShow":"fade","cssSelector":"ql-thumbnail","effectOnHideSpeed":"1200","allowOffScreenOverlay":false,"effectOnShowOptions":"{}","effectOnHideOptions":"{}","widgetClass":"OverlayWidget","captureClicks":true,"onScreenPadding":10}

Orion Telescopes
Vixen Astronomical BT81S-A Binoculars
Not Available
Accepted Payment
This product is no longer available for purchase.
  • 81mm twin mounted refractors make a great view even better using two eyes.
  • Focal length of 480mm (f/5.9)
  • 45-deg angle eyepiece focuser provides a comfortable angle for both astronomy and terrestrial viewing
  • Accepts 10mm or longer standard 1.25" astronomical eyepieces (sold separately)
  • Weighs 9lbs. Designed and Manufactured in Japan

Learn more
Item #  54434
Mfg Model #  14304

The Vixen Astronomical BT81S-A Binoculars provide a spectacular view of comets, star clusters, and other astronomical targets. The 45 eyepiece angle provides a very comfortable view when using these binoculars for either astronomy or long distance terrestrial viewing. The mechanics have been redesigned compared with the older model, making them 100mm shorter in length, 40mm lower in height, and 2 lbs lighter, providing a very compact body for the aperture.

The 81mm objective lens is coated with a magnesium-fluorite anti-reflective coating to boost the brightest of the image. The focuser end accepts standard 1.25" astronomical eyepieces (sold separately). It is recommended not to use eyepieces with shorter focal length (higher magnification) than 10mm with the BT81S-A. Weighs 9lbs 1oz. Designed and Manufactured in Japan.


This product is serviced and supported by its manufacturer according to the terms and conditions included in the packaged product. Orion's limited warranty does not apply. Please contact the manufacturer directly for technical support.

Product Support
Visit our product support section for instruction manuals and more
  • Optical diameter
  • Focus style
    Individual eyepiece focus
  • Tripod adaptable
  • Diopter adjustment
  • Weight
    9.0 lbs.
  • Other features
    Eyepieces sold separately
  • Warranty
    Five year


Orders received by 1pm Eastern Standard Time for in-stock items ship the same business day. Order received after noon will ship the next business day. When an item is not in-stock we will ship it as soon as it becomes available. Typically in-stock items will ship first and backordered items will follow as soon as they are available. You have the option in check out to request that your order ship complete, if you'd prefer.

{"closeOnBackgroundClick":true,"bindings":{"bind1":{"fn":"function(event, startIndex, itemCount, newItems) { QuickLookWidget.assignEvents(newItems); $(\".Quicklook > .trigger\", newItems).bind(\"quicklookselected\", function(event, source, x, y) {\'#_widget1067787729072\', event, source, x, y); }); }","type":"itemsloaded","element":".PagedDataSetFilmstripLoader > .trigger"},"bind0":{"fn":"function(){$.fnProxy(arguments,\'#_widget1067787729072\',,\'\');}","type":"quicklookselected","element":".Quicklook > .trigger"}},"effectOnShowSpeed":"","dragByBody":false,"dragByHandle":true,"effectOnHide":"fade","effectOnShow":"fade","cssSelector":"ql-category","effectOnHideSpeed":"1200","allowOffScreenOverlay":false,"effectOnShowOptions":"{}","effectOnHideOptions":"{}","widgetClass":"OverlayWidget","captureClicks":true,"onScreenPadding":10}