Vixen Optics BT81S-A 81mm f/5.9 Telescope Binoculars - Mint Condition with Vixen Eye Pieces as listed - $1800 + post
Included are the following
- Vixen Red Dot Finder
- 2 x Dew Heaters
- 2 x 6mm Vixen eyepieces
- 2 x 12mm Vixen SLV eyepieces
- 2 x 24mm Vixen SLV eyepieces
- GATOR Protector Travel Case
The 81mm BT81S-A Astronomical Binoculars OTA from Vixen Optics are astronomical observation binoculars 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 line-up of Vixen eyepieces and have an enormous 56-101mm interpupillary adjustment range to work with nearly any set of eyes, including many children's.
Specifications
- Air spaced doublet achromatic
- Magnesium fluorite coating
- Effective aperture 81mm
- Focal length 480mm @ F5.9
- 45 degree incorporated erect image diagonals
- Accepts multiple 1.25" eyepieces
- Visual back 31.7mm, 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
