William Optics ZenithStar 61 f/5.9 Doublet APO Refracting Telescope

  • 61 mm (2.41-inch) Aperture.
  • f/5.9 Focal Ratio.
  • 3.2 lb - Travel Telescope. 
  • Adaptable with any DSLR.
  • Astrophotography and Wildlife Photography.
  • Choose Between Red, Blue, or Gold Colors!
  • 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

Bright and colorful yet smaller than a house cat, the William Optics ZenithStar 61 is one of the most portable telescopes on the William Optics market. Weighing only about 3 lb, you can easily take it with you anywhere!

Your telescope’s lens captures true-to-color light and create images with reduced chromatic aberration. It’s designed with FPL-53 glass, which is a form of synthetic fluorite in the closest form to pure fluorite. Capture mesmerizing images with brighter and crisper viewing features.

When combined with a field flattener, this telescope can capture images like those of larger professional telescopes.

Williams Optics ZenithStar 61 Special Features

  • The full-frame sensor size is approximately 36X24.
  • A 41 mm-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
4.8 Based on 4 Reviews
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Filter Reviews:
Didhier M.
Panama Panama
Top quality refractpr

What can I say, this item is top quality. The materials are amazing and the refractor feels sturdy. Haven't tested on dark skies, but on my city, I can say that contrast and colors are better than a 200mm L canon Lens. Satisfied with the buy OPT customer service and quality of shipping is top notch as usual

A OPT  Customer
Jay S.
United States United States
Great service

Jake was terrific and answered all my questions or found the answers I needed when purchasing my WO Z61 and Field Flattener

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.