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William Optics 1.25" Binoviewer with Eyepieces


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  • Barrel Size: 1.25-inch.
  • Optical Path: 100 mm (4 inches).
  • Clear Aperture: 20.2 mm.
  • 20 mm Eyepieces and 1.6x Barlow Nosepiece are Included for Better Focusing!


Product Details


    The William Optics 1.25-inch Binoviewer gives you quality and affordability, the best of both worlds! Enjoy the benefits of a BaK-4 quality binoviewer in your refractor, Newtonian or SCT scope!

    The WO Binoviewers offer exceptional quality and attention to detail. These telescope binocular viewers are standard with an anodized aluminum finish to compliment any telescope and the anti-marring eyepiece-compression-ring system guarantees stability and security. Large chromed thumbscrews hold the William Optics Binoviewer to your focuser and the system works with a 1.25-inch or 2-inch star diagonal for added viewing comfort. Its 4-inch optical path means you'll have less trouble getting these binoviewers to come to focus with your telescope and the high-quality multi-coatings mean brighter, more contrast-enhanced views! William Optics tests their binoviewers before they leave the manufacturer for collimation and offers a two-year warranty against product defects. Please keep in mind that damage or loss of collimation from dropping or rough handling of binoviewers is not covered under warranty.

    Observe dimensional views of the Moon, planets, star clusters, nebulae, comets and more!

    William Optics 1.25-Inch Binoviewer Features:

    • Anodized aluminum finish.
    • Large chromed thumbscrews.
    • Anti-marring brass compression rings for your eyepieces.
    • Fully Multi-Coated.
    • Clear Aperture: 20.2 mm.
    • Eyepieces are helical focusing and held in place by compression rings
    • Dimensions: 120 mm x 112 mm x 42 mm
    • Optical Path: 100 mm (4-inch)
    • Weight: approx. 520 g (without eyepieces)
    • Manufacturer's Two year William Optics warranty.

    Image Note: The Gallery Image with an attached telescope is for use purposes only. The blue telescope is not included. 

    OPT Product Number: WO-E-BINO-P 

  • specifications

    Barrel Size1.25"
    Free ShippingYes
    Warranty2 Year Warranty
  • included items

    • 1.25-inch Binoviewer with anti-marring compression rings.
    • Two wide-angle (66-degree) 20 mm eyepieces.
    • Barlow nosepiece (1.6x).
    • Exclusive gift box.

Product Reviews

Customer Reviews
4.7 Based on 12 Reviews
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  • Mars
Denis D.
United States United States

Great quality for money

Very good binoviewer and realy nice pair of 20mm eyepieces, great quality for money.

Sherwood L.
United States United States

Short and light, but merging issues from eyepiece alignment

The binoviewers are relatively light and work with my Lunt LS80 (only if removing the spacer and using the 1.6x barlow). I can't get focus in my Skywatcher ProED 100 with or without the barlow. I often have difficulty merging the images because the eyepieces are not quite aligned. I can often rotate the focus knobs to get them to line up, but then one is out of focus. When I do get things working, it looks great, though.

karl g.
United States United States


the binoviewer has a couple of scratches on the body, which don't affect its function, though. the barlow has a stain on the lens and the plastic bag is much wrinkled. just wondered whether it was a returned item. i kept it and am trying to make the most out of it. right now in the middle of exploring all the possibilities shorten the light path on my nexstar 8se. after much research, it turned out i still need of get a bunch of extras to make it work, such as prism diagonal, different connection adapters, etc. and some of the more unique parts have to be ordered from as far as Russia.

Dave P.
United States United States

Wonderful Addition!

After decades in this hobby, I finally tried binoviewing. And after ordering the WOs from OPT, I am definitely hooked! Using the WOs with my 150 mak, I saw the most details on Mars I have ever observed. No more single eye squinting for me. Highly recommended!!

John B.
Japan Japan


So happy that I purchased the Binoviewer As somebody who is new to this hobby I was undecided as to which eyepieces to buy and I feel like this is a great place to start. The fact the the WO bino viewers come with eyepieces and the amazing price makes this a great first purchase. Also the service from OPT was excellent.

Russell M.
United States

William Optics Binoviewer - a Good Choice

This is a great way to get started in binoviewing. These work fine with my Celestron-11 SCT. When properly connected the magnification is around 150X with the supplied 20mm eyepieces. So not wide field, but great for smaller DSOs like globulars as well as for the Moon and planets. This is a quality product. The only small negative is the included 1.6X OCS (optical correction system) that threads into the binoviewer nosepiece is slightly smaller in diameter than 1-1/4 inch (1.22 inches). Thus the supplied cap for the nosepiece falls off when the OCS is attached. Other than that litlle problem everything has met or exceeded my expectations. I highly recommend this binoviewer.