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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 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.