Oberwerk BT-100-45 Binocular Telescope with Mount/Tripod – Oberwerk
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Oberwerk BT-100-45 Binocular Telescope with Mount/Tripod


Oberwerk BT-100-45 Binocular Telescope with Mount/Tripod


Oberwerk 45° 100mm Binocular Telescope, with 1.25″ focusers. Broadband multi-coating throughout. Includes one pair of 25x eyepieces, 7×50 finder-scope, aluminum case, fork mount, & TR3 hardwood tripod.

Choose Color: * 

“Big Eyes” Gray is sold out. Only Luna Pearl is available.

Tripod Options: * 

Optional Magnifications:

The highly-acclaimed Oberwerk BT-100-45 features 45° viewing and a strong and smooth fork mount, which together provide comfortable astronomical viewing from horizon to zenith. Of course the 45° 100mm Binocular Telescope also has Oberwerk’s signature broadband multi-coatings on every lens surface, including the triplet objectives and massive Porro prisms. 25x wide-angle eyepieces are included, but because of the industry-standard 1.25″ helical focusers, your favorite telescope eyepieces can be used as well. The optical train is based on the same proven design as the original 25/40×100 Long-Range Observation Binocular. For almost two decades, this was considered the world’s most powerful binocular, until it was edged out by our high-tech BT-100XL-ED. But the old-school BT-100-45 remains a popular choice- mounted on the included fork mount and hardwood tripod, it’s a majestic instrument at an affordable price.
The BT-100-45 is available in your choice of “Big Eyes” Gray or a lustrous “Luna Pearl” White.  Complete package price includes binocular, 7x50mm finder-scope, aluminum carrying case, American-made TR3 hardwood tripod, paint-matched aluminum fork mount, and 25x oculars. The tripod is available in your choice of hardwoods and finish colors. Custom laser-engraving is also available. If you need easy crank-up height adjustment, take a look at our Manfrotto 161MK2B tripod option. Need easy mobility? Just add the Manfrotto 181B Auto-Dolly. Because accurate collimation is critical at higher magnifications, every Oberwerk binocular is tuned to perfection prior to shipping- so even at the upper limit of magnification, you’ll enjoy perfectly-merged images. 3-year Limited Warranty.

Additional information

Weight 68 lbs
Dimensions 30 × 15 × 15 in
Focal Length



2.5° (25x)

Exit Pupil

4.0mm (25x)

Eye Relief

16mm (25x)

Minimum Focus

15 meters

IPD Range


Product Weight

BT-100-45-28 lbs., fork- 10 lbs., tripod- 12 lbs.


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