William Optics ZenithStar 103 f/6.9 Doublet Refracting OTA Telescope

    ZenithStar 103:
  • An f/6.9 FPL53 Doublet Air-Spaced APO
  • Housed in a CNC Machined Ultra-High Precision Lens Cell
  • An x 0.8 Flattener
  • 2.5-inch Rack-and-Pinion Robust Focuser, Dual Speed = 1:10
  • There is no image shifting!


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  • Regular price $1,198.00

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William Optics ZenithStar 103 f/6.9 Doublet Refracting OTA Telescope

The ZenithStar 103 (4.06-inch) aperture f/6.9 imaging APO is made in three colors: Gold, Blue, and Red. It has an innovative Bahtinov Mask Cover (Patented) included!

This beautiful scope has everything you could want from a refractor such as extreme sharpness for clear details and APO color correction. It has all the benefits of the ZenithStar family at a price that is hard to beat.

The William Optics ZenithStar 103 features an f/6.9 FPL53 Doublet air-spaced APO in a CNC machined ultra-high precision lens cell. With an x0.8 flattener, this can also become an f/5.5.

Comes with 2.5-inch rack-and-pinion ultra-robust focuser with 1:10 dual speed

Thanks to its design, there is NO image shifting, making this a real treat to use in astrophotography!

Despite its 103 mm objective, the scope is still very compact and solid. Many airlines will accept it as carry-on luggage! Perfect size for serious observations of deep sky objects and planets. Solar observations are possible with proper additional equipment.



    Aperture103 mm (4")
    Camera/Eyepiece Connection1.25" Nosepiece
    Dawes Limit1.13 arcseconds
    Focal Length710.7 mm
    Focal Ratiof/6.9
    Free ShippingYes
    Glass TypeFPL53
    Hightest Magnification206x
    Light Gathering Power217x
    Limiting Magnitude13.8
    Optical DesignDoublet
    Tube Diameter112mm
    Tube Length615mm
    Tube Weight9.61 lbs


      Standard Package:
    • Mounting Rings
    • Guiding Rings
    • CNC Carry Handle Bar
    • Long Vixen Style Dovetail Plate
    • 2.5-inch Rack-and-Pinion Focuser
    • Innovative Bahtinov Mask Cover (Patented)
    • Two-year, no fuss warranty and constant customer service!


      Optional Accessories:
    • M63 to 2-inch Rotolock
    • 1.25-inch Rotolock
    • 50 mm:  f/4 Rotolock Guide scope
    • New Full frame x 0.8 Flattener
    • Soft Carry Case