Vixen Binoculars BT-81S-A (45518)

Viewing the night sky through large-aperture binoculars creates a unique and immersive experience. Celestial objects appear almost three-dimensional, and well-known nebulae, globular clusters, and open star clusters look truly spectacular.

With interchangeable eyepieces and upright images, you can explore a wide range of targets, from deep-sky Messier objects to terrestrial landscapes.

The BT-81S-A uses two achromatic lenses, each made from two elements with natural multi-coating. Magnesium fluoride coatings help reduce chromatic aberrations. The focal length of 480 millimeters gives the instrument a fast aperture of f/5.9, making it excellent for viewing wide gaseous nebulae, star clusters, and comets.

The set includes a carrying handle, viewfinder shoe, dew shields, and dust caps. Eyepieces are not included, but any standard 1.25" eyepieces can be used.

Please note: The binoculars are supplied without eyepieces.

Made in Japan

Specifications:

Front lens diameter: 81 mm
Optical design: Porro prism
Lens coating: Fully coated (magnesium fluoride)
Interpupillary distance: 58 – 102 mm
Handle: Yes
Diopter adjustment: On both sides (single eyepiece focusing)
Water resistance: Not watertight, but splash-proof
Tripod connector: Yes (1/4" & 3/8")
Lens cover: Included
Eyepiece cap: Included
ED glass: No
Transport case: Not included
Series: BT
Weight: 4100 g
Length: 480 mm
Width: 190 mm
Height: 155 mm
Outer material: Aluminium

Recommended for:

• Astronomy: Very good

• Bird watching: Good

• Hunting, travel, sports, sailing, and theatre: Not recommended