Oberwerk BT-70-45 Binocular Telescope – Oberwerk
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Oberwerk BT-70-45 Binocular Telescope


Oberwerk BT-70-45 Binocular Telescope

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


Oberwerk 45° 70mm Binocular Telescope, the smallest and least expensive binocular with 1.25″ focusers on market. Includes 16x FMC oculars. Triplet objectives, broadband multi-coating throughout. Aluminum-frame case. Requires tripod mount.

Choose Color: *

“Luna Pearl” White is in stock. “Big Eyes” Gray is sold out!

asy-2010starproduct_logo100wThe new 45° 70mm Binocular Telescope is the smallest and least-expensive binocular telescope on the market. At just over a foot in length, it is approximately half the size of the 45° 100mm Binocular Telescope, and at 8.5 lbs., is just 1/3 of the weight. For those with limited space, or needing easy portability, this new model is a great choice. Of course it also has Oberwerk’s signature broadband multi-coatings on every lens surface, including the porro prisms and triplet objectives. Our finest 23.9mm (16x) fully multi-coated wide-angle (65° AFOV) eyepieces are included, and because of the industry-standard 1.25″ helical focusers, your favorite telescope eyepieces can be used as well. 8mm eyepieces will provide 48x magnification in this binocular, which is the recommended limit. The built-in retractable glare shields minimize reflections. Available in your choice of “Luna Pearl” White or “Big Eyes” Gray.
Complete package price includes binocular, removable handle, aluminum-frame case, and 16x eyepieces. If you need a mount, choose either the Oberwerk 5000 tripod/head, Manfrotto MT190X3 tripod/MVH500AH head, or the gorgeous Oberwerk TR3 hardwood tripod for the XL Series. To add a finder, order the BT-70-45 finder mount. Because accurate collimation is critical at higher magnifications, every Oberwerk binocular is collimated prior to shipping- astronomy072013-1so even at high magnifications, you’ll enjoy perfectly merged images. 3-year Limited Warranty.
Here is a BT-70-45 review by Phil Harrington from the July 2013 issue of Astronomy Magazine.

Additional information

Weight 24 lbs
Dimensions 19 x 19 x 11 in

4.0° (16x)

Exit Pupil

4.3mm (16x)

Eye Relief

16mm (16x)

Minimum Focus

15 meters

IPD Range


Product Weight

8.5 lbs.

6 reviews for Oberwerk BT-70-45 Binocular Telescope

  1. Rated 5 out of 5

    Harry Maynard

    I received my binocular telescope today and I wanted to thank you for the expedited shipping. The binoculars are amazing!! They look gorgeous, are very solid, plus the daytime images are clearer and sharper than I have ever seen in any binocular. I really like it and hope to use it tonight for our 2nd gathering since (at last) we are supposed to have clear skies. Again, thank you so much for your help – this is going to be a great asset for my classes and my own personal use.

  2. Rated 4 out of 5

    David Williams

    BT-70-45 Binocular Telescope was purchased back on November 2016. It’s a truly amazing instrument. The best instrument for astronomy are the ones that are used the most, the portability speaks for itself. There is no reason to be lazy and say “I’m not carrying out this heavy equipment today.” Optical wise the best $800.00 I’ve ever spent. Views of Orion, Cygnus, Lyra constellation, the moon – day or night are amazing. We heard before but good things come in small packages. The only thing I would suggest to the manufacturers is to machine in threads to add filters to the front objective lenses.

    • Kevin Busarow

      Glad to hear you are thrilled with your BT-70-45. Regarding filters, filters thread on to the eyepiece barrel ends. All of our eyepieces, except for the 16x, are threaded for filters. Only solar filters go in front of the objectives, and those are felt-lined to fit snugly over the glare shields.

  3. Rated 5 out of 5

    Ron Bowers (verified owner)

    Siberia optics at an affordable price. I use the iphone mount to photograph thru the right side . much fun to have a record of what you see, and less tiring once you have the mount set up. Highly recommended.

  4. Rated 5 out of 5


    I’m living in Italy, in the mountains of Umbria, where the sky is deep and clear. In 1972 Albert Hammond and Mike Hazlewood wrote the song “It Never Rains in Southern California”. However, it is also valid for Umbria 🙂
    So I’m using my BT-70-45 nearly every night and I like this instrument more and more! Today at 5 a.m. I observed the Orion Nebula and the galaxies M81, M82 in the Ursa Major. The binary Albireo I can clearly resolve already with the 16x eyepieces. Even the Ring Nebula, the Dumbbell Nebula and many Globular clusters are visible clearly.
    I’m writing to you to tell you THANK YOU! for the good job you do!

  5. Rated 5 out of 5

    Jeremy Smith

    I was thrilled to purchase a BT-70-45 several years ago with the intention to “learn how to map the sky”. The portability and clarity are both outstanding and the ease of use is excellent. I’m so confidant in the quality of this product that it’s become part of my son’s inheritance. He’s two.

  6. Rated 5 out of 5

    DwightJones (verified owner)

    I was a bit shy about buying binoculars that cost as much as a decent telescope, but now I’m very happy with the purchase. These portable binoculars make it easy to go out and observe the stars. I live in a dark sky area, but need to go down the street to get out of the trees. It’s an easy walk with the BT-70-45 and a tripod. The view is wide and very sharp.

    I compared the Oberwerk eyepiece with inexpensive Celestron eyepieces of similar focal length. The Oberwerk eyepieces give a much wider view and are definitely the way to go. I would recommend getting a small number of these rather than a larger number of cheap eyepieces. The case has room for three pairs of eyepieces and a finder. I think this will be plenty.

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