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William Optics ZenithStar 81 f/6.9 Doublet Refracting OTA Telescope - Red


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  • Aperture: 81mm
  • Ideal for astrophotography.
  • Includes protective Soft Case.

Product Details

  • The William Optics ZenithStar 81 mm aperture Doublet APO Refactor is an extremely versatile telescope ideal for both astrophotography and general photography. It provides a sharp image to any DSLR, and pristine clarity for both visual observers and astrophotographers. This scope series is even capable of handling full frame sensors.

    Zenithstar Dimensions

    This air-spaced 81 mm series utilizes FPL53 glass for the clear detail provided and sharp colors. Similar to past models, this series also includes a 1:10 dual speed, 2.5-inch, R&P ultra robust focuser. 

    ZenithStar Focuser


    William Optics has crafted this series as an f/6.9 for respectable speed. On top of that, each scope in the series comes with a built-in, removable, clear Bahtinov mask for convenience in focusing. 

    ZenithStar Bahtinov Mask

    These OTAs include a dual-side dovetail compatible with Vixen and Arca Swiss stylings.

    ZenithStar Plate Design


  • specifications

    Aperture81 mm (3.25")
    Focal Length559 mm
    Focal Ratiof/6.9
    Free ShippingYes
    Glass Type53
    Optical DesignDoublet Refractor
  • included items

    • ZenithStar 81 Telescope
    • Protective Soft Case

Product Reviews

Customer Reviews
5.0 Based on 2 Reviews
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Filter Reviews:
    David I.
    United States United States
    A High Quality Refractor That Will Enrich Your Life

    Excellent quality, and reasonably priced portable telescope. The build and craftsmanship of this scope is amazing, and the design and color scheme is absolutely beautiful. The focuser is also of excellent quality allowing for both coarse and fine adjusments. I tried it out the other night on the Moon and a star named Capella. The moon offered amazingly crisp images and stars appear as pinpoints of light. Capella, this scope's "first light" was a beautiful orange star. As it is very portable, you can easily transport this scope to remote viewing sites for visual and astrophotograpy work. The scope came with a padded carrying case, making it easy to store and transport. If you are considering a refractor telescope purchase, consider William Optics as a potential selection. You will not be disappointed.

    Carl M.
    United States United States
    William Optics ZenithStar 81 f/6.9 Doublet

    Beautiful scope ,everything I expected quality thru and thru .....