BT-100XL-SD Binocular Telescope


BT-100XL-SD Binocular Telescope

(2 customer reviews)


Out-of-stock until mid-Aug. Order now to get on the waiting list.


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 5000 tripod/head, or the Oberwerk TR3 hardwood tripod with carbon-fiber elevator with either the Oberwerk 5000 head or the Manfrotto Nitrotech head. 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.

2 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.

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