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William Optics ZenithStar 61 f/5.9 Doublet Refracting OTA Telescope

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  • Regular price $478.00

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Accessories Added

  • 61 mm (2.41-Inch) Aperture
  • Focal Ration: f/5.9
  • 2-Inch Dual Speed Focuser
  • Innovative Bahtinov Mask Cover (Patented) included



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 (2.5")
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 
  • 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.