Vixen Optics BT-81S-A Astronomical Binocular and Berlebach Tripod

Vixen Optics BT-81S-A Astronomical Binocular and Berlebach Tripod

Vixen Optics BT-81S-A Astronomical Binocular and Berlebach Tripod

Vixen Optics BT-81S-A Astronomical Binocular and Berlebach Tripod

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Product Highlights

  • Large 80mm Objective Lenses
  • Built-In 45° Erect-Image Prisms
  • Anti-Reflection Multi-Coated Optics
  • Two 20mm SLV-Series 1.25" Eyepieces
  • Accepts Any 1.25" Astronomical Eyepieces
  • Individually Focusable Oculars
  • 3-Way Head with Control Handle
  • Ash Wood Tripod with Accessory Tray
  • Adjustable Height and Leg Spread Angle
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  • 1Description

Providing awe-inspiring views of comets, star clusters, the Moon, and many other celestial subjects, the Vixen Optics BT-81S-A Astronomical Binocular and Berlebach Tripod provides users with a complete observational rig for both astronomical and terrestrial viewing. Its large 81mm aperture and 480mm focal length make this a powerful optic, and with twin 1.25" eyepiece holders, you can use any telescope eyepieces to tailor the magnification to the specific demands you put on it. To get you observing right out of the box, Vixen gives you two 20mm SLV-series eyepieces which yield 24x magnification. Anti-reflection fully multi-coated optics and achromatic lens system ensures bright and clear high-contrast images with rich color rendition.

The binoculars mount on the included head that is capable of tilting 180° forward and back so it's ideal for both astronomical and terrestrial viewing, especially if the binocular is set on a balcony, and you're looking down at a boat or bird. The included tripod is produced by Berlebach in Germany and made of solid ash wood, with a matching tray that not only keeps small accessories safe but locks the legs at a 23° angle for increased stabilization and vibration reduction. The legs lock into multiple angles to accommodate uneven terrain, and the leg height is adjustable for comfortable use by a wide range of users. This tripod not only offers a rock-steady observational base for a wide range of users, it also presents a refined and elegant look.

  • 25x81 BT81S-A Astronomical Binocular with 20mm SLV Eyepieces

    The 25x81 BT81S-A Astronomical Binocular from Vixen Optics features interchangeable eyepieces that provide exceptional terrestrial or celestial observing. The twin 480mm f/5.9 achromatic refractors have permanently attached 45° diagonals and accept any 1.25" eyepieces. With a broad 56-101mm interpupillary adjustment range this powerful optic will fit 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 two Vixen 20mm SLV-series eyepieces. The eyepieces are fully multicoated, with long eye relief and twist-up eyecups. A required mount and a tripod or base need to be supplied by the user.

    Apparent angle of view: 50°
    Accepts any 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"
    Two fully multicoated Vixen 20mm SLV-series eyepieces with pop-up eyecups
    Twin 480 mm f/5.9 achromatic refractor telescopes with 45° incorporated erect image diagonals
  • StarGuy Tripod with 2-Way Tilt Head

    The StarGuy Tripod with 2-Way Tilt Head from Vixen Optics is composed of Berlebach Tripod Report 212 and 2-Way Tilt Head.

    The Tripod Report 212 has a load capacity of 44.1lb and has adjustable leg spread at angle of about 20°, 40°, 60°, 80° and 100°. It features a mounting head with 1/4"-20 standard spring-mounted fastening screw. The deposit tray is included and the practical tray for small items fits between the tripod legs to provide additional stability. It provides vibration damping.

    The 2-Way Tilt Head comes integrated with quick release-coupling and can be quickly mounted to 90° offset using the added hexagon socket wrench. In this way, you can use this head as 3-way tilt head without limitation by means of an elbow that is attached to the camera. You can lock both planes thanks to the mechanical system via one sole clamping element. The friction adjustment for the vertical tilt is made via an adjusting wheel opposite to the clamping element. The guide handle is mountable for both right and left handed persons. Besides capturing images, this tilt head is particularly suitable for observations with a spotting scope or with binoculars.

  • 25x81 BT81S-A Astronomical Binocular with 20mm SLV Eyepieces
    Magnification 25x
    Objective Lens Diameter 81mm
    Angle of View 2.0° (actual)
    Field of View 105.0' @ 1000 yd / 35.0 m @ 1000 m
    Minimum Focus Distance Not Specified by Manufacturer
    Exit Pupil Diameter 3.24 mm
    Eye Relief 19.5 mm
    Interpupillary Adjustment 8.7 - 15.7 mm / 22.0 - 40.0"
    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 lb / 4.1 kg

    optical assembly only

    Packaging Info
    Box Dimensions (LxWxH) 29.0 x 13.0 x 12.0"
  • StarGuy Tripod with 2-Way Tilt Head
    Load Capacity 44.1 lb (20 kg)
    Transport Length 29" (74 cm)
    Height Minimum: 3" (8 cm)
    Maximum: 44" (112 cm)
    Weight 6.2 lb (2.8 kg)
    Thread Bottom: 3/8" (threaded socket to 1/4" is included)
    Load Capacity 11 lb (5 kg)
    Height 3.5" (9 cm)
    Weight 1.54 lb (0.69 kg)
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