Skip to content
IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
William Optics Binoviewer Complete Package
William Optics Binoviewer Complete Package
William Optics Binoviewer Complete Package
William Optics Binoviewer Complete Package
William Optics Binoviewer Complete Package
William Optics Binoviewer Complete Package
William Optics Binoviewer Complete Package
William Optics Binoviewer Complete Package
William Optics Binoviewer Complete Package
William Optics Binoviewer Complete Package
William Optics Binoviewer Complete Package

William Optics Binoviewer Complete Package

by William Optics
SKU WO-E-BINO-P
$369.00 - $369.00
$369.00
$369.00 - $369.00
$369.00
Price Match Policy!
  • Includes two 20mm 66° wide-angle eyepieces
  • High-quality BaK4 prisms with full multi-coatings
  • Large 20mm clear prism aperture prevents vignetting
  • Includes 1.6x Barlow nosepiece to ensure focus with most telescopes
  • Individual helical eyepiece focusing for perfect sharpness
  • Accepts standard 1.25" astronomy eyepieces
7 in stock
FREE Shipping in CONUS
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • William Optics Binoviewer Complete Package

    The William Optics Binoviewer package transforms solo eyepiece viewing into an immersive, two-eyed experience, delivering a matched pair of 20mm wide-angle 66° eyepieces for immediate use. Its optical path is built around high-grade BaK4 prisms with a 20mm clear aperture to maximize brightness and eliminate vignetting. This complete set includes a 1.6x Barlow nosepiece, which extends your telescope's focal point to ensure the binoviewer can reach focus in nearly any instrument, from Schmidt-Cassegrains to Newtonians.

    20mm BaK4 Prisms: Bright, High-Contrast Binocular Views

    At the heart of the William Optics Binoviewer are oversized, fully multi-coated BaK4 prisms. The 20mm clear aperture is critical for passing the full light cone from your telescope to both eyes without clipping the edges of the field, a common issue in binoviewers with smaller prisms. This design preserves the brightness and contrast of your telescope, delivering views that are rich in detail and free of false color.

    • BaK4 Glass: Provides higher refractive index and minimizes internal reflections for a cleaner, higher-contrast image compared to lower-grade prism glass.
    • Fully Multi-Coated Optics: Every air-to-glass surface is coated to maximize light transmission, ensuring the view remains bright even after splitting the light path between two eyes.

    Precision Mechanics: Individual Focus and Brass Compression Rings

    Built for durability and ease of use, the binoviewer body features a white powder-coated finish and large, chromed thumbscrews for easy handling with gloves. Each eyepiece holder incorporates an independent helical focuser, allowing you to precisely compensate for differences between your eyes to achieve a perfectly merged, sharp image. The 1.25" holders use non-marring brass compression rings to securely grip your eyepieces without scratching the barrels.

    A Complete 66° Viewing System with a 1.6x Barlow

    This is not just a binoviewer body; it's a complete observing system. William Optics includes a matched pair of 20mm wide-angle eyepieces with a 66° apparent field of view, providing an ideal starting point for lunar, planetary, and deep-sky observation. The critical component for many users is the included 1.6x Barlow nosepiece. Most telescopes, especially Newtonians, lack the back focus required for a binoviewer; this Barlow extends the focal plane outward, guaranteeing you can achieve a sharp image without modifying your telescope.

  • What is the purpose of the included 1.6x Barlow with the William Optics Binoviewer?

    The 1.6x Barlow is essential for reaching focus in telescopes with limited back focus, such as most Newtonian reflectors and some refractors. Binoviewers require a long light path, and this Barlow pushes the telescope's focal point outward to meet that requirement. It also provides a moderate increase in magnification.

    Can I use my own 1.25" eyepieces with the William Optics Binoviewer?

    Yes. The William Optics Binoviewer is compatible with most standard 1.25" eyepieces. For best results, you should use two identical eyepieces (a matched pair) to ensure a perfectly merged and comfortable view. The brass compression rings will hold them securely without damaging their barrels.

    Why do I need individual eyepiece focus on the WO Binoviewer?

    Individual focus adjustment allows you to compensate for differences in vision between your left and right eyes (diopter correction). By focusing each eyepiece separately, you can achieve a single, perfectly sharp image that is comfortable to view for extended periods, reducing eye strain.

    How will the William Optics Binoviewer perform on the Moon and Jupiter with my 8" SCT?

    An 8" SCT is an excellent match for this binoviewer. The two-eyed view adds a remarkable sense of depth and dimensionality to lunar craters and mountain ranges. On Jupiter, you'll find it easier to perceive subtle details in the cloud bands and spot the Galilean moons. The included 20mm eyepieces and 1.6x Barlow will provide a high-contrast, comfortable view of both targets.

    Will the William Optics Binoviewer reach focus in my 10" Dobsonian?

    Yes, most likely. Most commercial Dobsonian (Newtonian) telescopes do not have enough inward focuser travel to reach focus with a binoviewer alone. However, this package includes the 1.6x Barlow nosepiece specifically to solve this problem. By inserting the Barlow, you will almost certainly be able to achieve focus.

    Are the included 20mm eyepieces good for deep-sky objects like the Orion Nebula (M42)?

    Absolutely. The 20mm eyepieces provide a moderately low power and a wide 66° field of view, making them excellent for framing larger deep-sky objects like the Orion Nebula (M42), the Andromeda Galaxy (M31), or open clusters like the Pleiades (M45). The binocular view can make these objects appear more three-dimensional against the background sky.

  • Prism Type BaK4
    Prism Clear Aperture 20mm
    Optical Coatings Fully Multi-Coated
    Eyepiece Compatibility 1.25" Barrels
    Eyepiece Holders Brass Compression Rings
    Focusing Individual Helical Diopter Adjustment
    Included Eyepieces 2x 20mm Wide Angle
    Eyepiece Apparent Field 66°
    Included Barlow 1.6x Magnification Nosepiece
    Finish White Powder Coat

    • William Optics Binoviewer Body

      × 1

    • 20mm WA 66° Eyepieces

      × 2

    • 1.6x Barlow Nosepiece

      × 1

    • Protective Caps

      × 3

    • Presentation Gift Box

      × 1

  • William Optics 2-Year Warranty