BT-100XL-SD Binocular Telescope


BT-100XL-SD Binocular Telescope

(3 customer reviews)


“Out of stock, more arriving early Nov. Order now to reserve one.


The BT-100XL-SD is the pinnacle of Oberwerk optical technology- a 100mm binocular telescope, with apochromatic optics, weighing a mere 12.5 lbs! With 100mm FCD100 objectives, 24mm of clear prism aperture, and a lightweight magnesium alloy body (waterproof and nitrogen-filled), this binocular telescope sets a new standard for image quality AND portability. A binocular of this quality deserves great eyepieces, so we include our finest 70° AFOV 14mm (40x) eyepieces. The SD objectives eliminate chromatic aberration up to 80x magnification (7mm eyepieces). With the widest IPD range of any binocular on the market (50-80mm), even small children can view through both eyepieces.
Other features include a Picatinny rail handle (for mounting a wide variety of finders or laser pointers) and extendable glare shields. Not only is the BT-100XL-SD the highest-quality binocular telescope on the market, with its lustrous “Luna Pearl” White finish and gold-anodized trim, it’s also the most attractive! Our exclusive heavy-duty aluminum-frame case is included. Recommended mounts include the Oberwerk TR3 hardwood tripod with carbon-fiber elevator with either the Oberwerk 5000 head, Manfrotto 608 Nitrotech head, or the Oberwerk XL-240 Fork Mount. Every Oberwerk binocular is tuned to perfection prior to shipping- so even at extreme magnifications, you’ll enjoy perfectly merged images.
3-year Limited Warranty.
XL Series Options and Accessories

Additional information

Weight 30 lbs
Dimensions 29 × 15 × 12 in
Focal Length



1.75° (40x)

Exit Pupil

2.5mm (40x)

Eye Relief

18mm (40x)

Minimum Focus

25 meters

IPD Range


Product Weight

12.5 lbs.

3 reviews for BT-100XL-SD Binocular Telescope

  1. Jorge Garcia (verified owner)

    I got this binocular to explore the city of Los Angeles. They do not disappoint. The optics are amazing! The design and color are spectacular; at 40X magnification out the box was my favorite. I was looking for a higher resolution and I bought the Oberwerk 7mm and I can’t get he whole field of view with 2 eyes so I do not recommend it and I have to use one piece like a telescope. I will try to get Explore Scientific 82° 6.7mm Eyepieces so I can see the whole field of view. I am in love with this piece of equipment. I have seen the moon, Mars and the stars look just amazing. I am exploring the city of Los Angeles and even with the pollution still an amazing city to look at. I will recommend this binoculars to everybody!

    • Kevin Busarow

      Our 7mm eyepieces have been redesigned with a tapered top to make them more comfortable. We’ve exchanged Jorge’s 7mm’s with the new design and I believe he’s happy with them.

  2. Ahmad (verified owner)

    The clarity of this Binocular telescope, far exceeds my other binocular from other companies. I use to get eye fatigue after 30 min of looking at the stars with my other telescopes, but with this awesome Oberwerk telescope, I spend hours looking at the stars and no eye fatigue, its amazing. Also, Kevin and his team provide an immaculate customer service experience.

  3. Dan (verified owner)

    I wanted an ED giant binocular and was looking at many models. In the end I decided to go for the latest BT-100XL-SD for the FCD 100 glass. Before I mention the clarity of view, I will mention the bins fit perfectly on my existing professional mount (Vixen Altazimuth folk and bracket and 130 Tripod) but also on my grab and go Benro A-357 tripod and Manfrotto Micro Fluid Head. Additionally my William Optics 20mm eyepieces for their binoviewer and two AstroTech 7mm eyepieces fill out the binoculars magnification range without additional purchases. So, the bins mesh with my existing equipment quite well. Now on to their ease of use. I am able to quickly set up for nighttime viewing for clear CA free views of planets and globular clusters, etc. But I can set these up and my wifes Meopta Meopro 20-60x fluorite birding scope in less than 5 minutes for great birding. Most surprisingly, to me, the magnification roughly doubles the 60x from the Meopta and is far more detailed. I was looking at a Great Blue herons eyeballs and upper body across a lake. The Meopta loses a good bit of clarity at 60x and you have to back off to 40x or so for clarity. The Oberwerks bins at 80x (560mm/7mm) blew me away. Last, being able to hoist the entire grab and go tripod/head/bins and walk 20 feet to the other side of a small peninsular and switch around 180 degrees without much hassle was priceless. The little red dot sight I mounted on the top rail, makes immediate bird target acquisition an easy chore. During our first outing with the new bins my wife was able to find a new rarity (Pomarine Jaeger) on McGee Lake near Amarillo Texas. Thanks so much for the fine product!

  4. Steve and Jeanna Channel

    Finally! The skies here in the Midwest cleared and my schedule permitted me to do a “first light” evening with the stunning Oberwerk BT-100XL-SD binocular telescope I’d received over a month ago! Honestly, I might have been perfectly happy just looking at this beautiful instrument mounted on the Manfrotto head atop one of Oberwerk’s well crafted Maple Tripods sitting in our living room!! It is beyond well-made….it’s finish and balance are superb. I just knew something that looked that good simply had to function well.
    I was not disappointed! Once set up, I covered it with a dew shield and waited for darkness. Right out of the gate, the crescent moon jumped out from the 14mm eyepieces with clarity and detail. Frankly, it looked better than my 11in dobsonian with a Zambuto mirror….really! I gave my wife a quick tour of the various craters and other features dramatically highlighted at the terminus shadow before the moon fell below the horizon. Then it was time to go check out some old familiar friends. The Double Cluster in Perseus sparkled throughout the amazing field of view that the Oberwerk 14mm eyepieces achieve. Stars were pinpoint across the field, with no drop-off at the field edges. No false coloring or aberration in any of the objects we observed. The Pleiades were equally well defined, taking up the entire FOV. We turned to Andromeda which extended beyond the viewing window!
    Set-up and take down are simple and quick. The release mechanism on the Manfrotto head will take some practice for me. The weight of the binoculars make it a bit awkward to hold whilst simultaneously engaging the two levers required to release the base plate. I’m certain I’ll get better at that with a few more sessions. We did discover that an adjustable viewing chair was quite helpful given the change in angle when viewing several objects especially those closer to zenith. My wife, being rather short, needed some help in finding a comfortable position and a quickly-adjusted chair was a great option there.
    The bottom line: we are delighted with the entire Oberwerk process from purchase, shipment, to customer interaction. This binocular telescope is now our absolute “go to” for viewing. It is readily transported in the well made aluminum case and canvas tripod cover. We bought it as a “take along” instrument in our RV travels across the country. It will serve that role very well….in fact, I sold the dobsonian! This Oberwerk is all we need to enjoy both earth and sky! Thanks Folks!!!

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