Oberwerk BT-100-45 Binocular Telescope – Oberwerk
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Oberwerk BT-100-45 Binocular Telescope


Oberwerk BT-100-45 Binocular Telescope

(6 customer reviews)
5.00 out of 5 based on 6 customer ratings


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

Tripod Options:

Optional Magnifications:

The highy-acclaimed Oberwerk BT-100-45, the world’s most powerful binocular, features 45° oculars 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 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 rest of the binocular, including the semi-apochromatic triplet objectives, is the same proven design as found in the original 25/40x100mm Long-Range Observation Binocular.
Complete package price includes binocular, removable handle, 7x50mm finder-scope, aluminum carrying case, wooden tripod with fork mount, and 25x oculars. The tripod can be upgraded to our premium jarrah hardwood tripod. Either tripod can also be custom laser-engraved. 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 collimated 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 x 15 x 15 in

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.

6 reviews for Oberwerk BT-100-45 Binocular Telescope

  1. Rated 5 out of 5

    I’ve had my BT-100-45 Oberwerk binoculars for approximately six months. Simply put they are fantastic, greatly exceeding my expectations! Adding the wood tripod transforms the binoculars into a great piece of furniture as well.

  2. Rated 5 out of 5

    I was looking to add astronomy binoculars to go along with my 12″ Meade LX200.

    I wanted the binoculars to use as more of a grab and go when I did not want or have the time to set up the big telescope. Also, I wanted to bring it with me to astronomy club star parties.

    I am impressed with the quality of construction and optics. The interchangeable eyepieces are a great advantage. You can use most 1.25″ eyepieces (check with Oberwerk on which ones work best).

    I had debated about getting the BT-70-45’s. They are also excellent. The trade off between the two is portability 50 pounds vs 15 pounds with the tripod and cost. I went to Oberwerk in Dayton with my wife to look at both. She knows me very well and said that if I get the smaller ones, a year from now I will be wanting the BT-100’s

    I also bought the 12mm eyepieces for $179. This gives a 50x magnification. I took the BT-100’s to Panama City Beach last week and the Orion nebulae filled the 70 degree field of view at 50x.

    I recommend these without hesitation.

  3. Rated 5 out of 5

    Just wanted to let you know that I had the chance to take the new Oberwerks down to Oklahoma on vacation from 14 Dec through 5 Jan to my typically dark and clear hide out at Greenleaf State Park. I hate using cliches; however, one with only one word describes the experience: AWESOME !
    We had visitors staying in other cabins come by and to look at the magnificent things that I could show to them (of course the price of a peek is an astronomy lesson). I even met a few days later that thanked me for the opportunity to use the binoculars. It is a thrill to use an instrument like this; but, an extraordinary experience when you can share it. Even the Park Ranger got involved. I just wanted to say thanks again and to let you know how much I love the Oberwerk BT-100-45. It was a step up by light years from the Celestrons that I purchased the year before. Well worth the investment!

  4. Rated 5 out of 5

    The binocular is absolutely fantastic!!! I’m a true novice but I know superior quality when I see it & use it. Terrific product that gives me hours of pleasure. Thank you so much!

  5. Rated 5 out of 5

    Got the new equipment, tried it out and absolutely love it!!! Today was a clear today and I discovered a new airport runway on the mountain range across from me – could see wind socks, planes, etc. I went to Google Earth and discovered that it is 13 miles away! Very cool!! Thanks so much.

  6. Rated 5 out of 5

    The three package shipment arrived yesterday complete and intact with no apparent shipping/handling damage. The BT-100/45 really is a “work of art” meant to be on proud display when not being used for its’ intended purpose. I don’t know if I have ever seen a more substantial/excellently designed and produced piece of astronomical hardware. The Jarrah wood used for the tripod is absolutely beautiful and, as I said, should be displayed so as to fully appreciate the craftsmanship. I just wanted to thank you again for the excellent communication/assistance you provided.

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