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

This product has been discontinued.

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

(1 customer review)

This product has been discontinued.

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.

This product has been discontinued. You may be interested in:

BT-100XL-ED Binocular Telescope

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 finished in 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.

1 review for Oberwerk BT-100-45 Binocular Telescope with Mount/Tripod

  1. Wizard (verified owner)

    After prolific on-line research… I finally ordered the BT-100/45 Binocular Telescope with Mount & Walnut Tripod. I also ordered additional 50x & 75x eyepieces to add a more widely-diverse range to my terrestrial & celestial viewing experience. Kevin is very knowledgeable about all optics & was very helpful providing the guidance that I needed to make my final decision. Throughout the ordering process Linda & Kevin were both very accommodating & patient with me to ensure that my order was exactly as I wanted it.
    After rapidly receiving my order in the mail… there was only one minor issue with shipping which was quickly rectified immediately by Kevin, which speaks to their outstanding customer service. My binocular came durably packaged in a padded metal case for optimum protection.
    I was very delighted to discover the superb overall build-quality of the binocular, fork-mount & tripod. The viewing quality of the glass-optics were amazing, & the intuitive focus-controls were very simple & quick to acquire my desired visual target. The durable-materials, beautiful-design & smooth-functionality of this heavy-duty BT-100/45 Binocular make this premier optical device not only highly useful & fun to use… but also an extremely attractive work of art to look at when not in use.
    The dark, rich walnut tripod is very beautiful, highly durable, is easy to operate & provides a very stable base for this substantial binocular.
    My compliments to Kevin & his entire staff at Oberwerk for creating outstanding optical equipment that is beyond reproach & second-to-none in the optics industry. I highly recommend this optical equipment & this company without reservation, & I look forward to doing business with them in the future!

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