Vixen Optics 25x81 BT81S-A Astronomical Binocular OTA ( Award Winning Binocular Telescopes)

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Part Number: 14304

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Description

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

Specifications

Magnification	25x
Objective Lens Diameter	81mm
Angle of View	2.0° (actual)
Field-of-View	105' @ 1000 yd / 34.86 m @ 1000 m
Minimum Focus Distance	Not Specified By Manufacturer
Exit Pupil Diameter	3.24 mm
Eye Relief	19.5 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 close

In the Box

Vixen Optics 81mm BT81S-A Astronomical Binocular - OTA

Mount Block

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Vixen Optics 25x81 BT81S-A Astronomical Binocular OTA ( Award Winning Binocular Telescopes)

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