William Optics ZenithStar 61 f/5.9 Doublet APO Refracting Telescope

  • William Optics ZenithStar 61 mm (2.4-inch) Aperture Doublet APO Refractor
  • Choose Red, Blue, or Gold colors
  • f/5.9 Focal Ratio
  • 3.2 lbs
  • Innovative Bahtinov Mask Cover (Patented) for easy focus assist


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  • Regular price $478.00

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William Optics ZenithStar 61 f/5.9 Doublet APO Refracting Telescope

The William Optics ZenithStar 61 mm (2.4-inch) Aperture Doublet APO Refractor is the most versatile and portable telescope made by William Optics. Get the best of two worlds with this portable refractor weighing only 3.2 lbs., but built durable like all William Optic refractors.  

The ZenithStar 61 telescope includes a Patented Bahtinov Mask cap design to help you easily achieve sharp focus quickly. 

Your telescope is excellent for wide-field colorful views of stars and nebulae along the Milky Way. Made with carefully formulated, synthetic fluorite glass, or FPL53, your telescope achieves the best color correction. It provides a sharp image for any DSLR for astrophotographers or landscape photography. 

Special Features

  • The full frame sensor size is approximately 36X24.
  • A 41mm-diameter image circle.
  • The Focuser is 50.8 mm (2-inch), rack and pinion, with 10:1 dual speed micro focuser and a 75 mm travel length. 
  • A rotatable L mounting bracket.
  • The tube length has a range of 230 mm when fully retracted, and 300 mm when fully extended.



Aperture61 mm (2.5")
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.
  • Patented Bahtinov Mask cap design
  • 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 Included.


Customer Reviews

4.5 Based on 2 Reviews
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Frank C.
United States

William zenithstar 61mm

Great telescope . The guys at OPT . Very knowledgeable and there to answer questions. Thanks

allen f.
United States

Bright Power House

This little scope is beautiful in looks and performance. Mine is yellow. The optics are crisp and clear. The focuser is smooth and and the back travel is plenty long. Have used it on terrestrial and celestial targets. Get sharp pictures in both cases. Plus, the little power house can be taken places where my 10” Dobsonian is just to big and heavy.