William Optics ZenithStar 61 f/5.9 Doublet Refracting OTA Telescope

  • Sale
  • Regular price $450.00
  • William Optics ZenithStar 61 f/5.9 Doublet Refracting OTA Telescope

    • Sale
    • Regular price $450.00
    • ITEM #

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    • 61 mm (2.41-Inch) Aperture
    • Focal Ration: f/5.9
    • 2-Inch Dual Speed Focuser


    William Optics ZenithStar 61 f/5.9 Doublet Refracting OTA Telescope

    The William Optics ZenithStar 61 mm (2.4-Inch) Aperture Doublet APO Refactor is the most versatile and portable telescope made by William Optics. It provides a sharp image any DSLR for both visual observers and astrophotographers. 

    The dispersion properties of the ED and SD Glass used in the objective lens are important in determining the overall color correction.  With an Abbe index number V, the top notch glass material FPL53 is used for the best achievable color correction.  The full frame sensor size is approximately 36 x 24 mm.   

    The objective Type is Synthetic Flourite FPL53 Doublet, Air Spaced, Apochromatic Refractor, fully multi-coated, SMC coating. The Lens Shade is retractable.

    It has a Focal Ratio of f/5.9. 

    The Focuser is 50.8 mm (2-inch), rack and pinion, with 1:10 Dual Speed micro focuser. There is 75 mm focuser travel length. Your visual/camera connection is with a 1.25-inch compression ring adapter. 

    Included is a rotatable L mounting bracket.

    The tube length range is 230 mm when fully retracted to 300 mm when fully extended.



    Aperture61 mm (2.4")
    Camera/Eyepiece Connection1.25" Compression Rings
    Dawes Limit1.9 arcseconds
    Focal Length360mm
    Focal Ratiof/5.9
    Free ShippingYes
    Glass TypeFPL 53
    Hightest Magnification122x
    Light Gathering Power76x
    Limiting Magnitude12.7
    ManufacturerWilliam Optics
    Optical DesignDoublet
    Tube Length230mm
    Tube Weight3.2 lbs
    • William Optics ZenithStar 61 f/5.9 Doublet Refracting OTA 
    • Rack and Pinion Focuser 50.8 mm (2-inch), 1:10 Dual Speeds, with 75 mm travel length
    • 1.25-inch compression ring adapter
    • A rotatable L mounting bracket


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