William Optics ZenithStar 103 mm Refractor (Blue)

  • 103 mm, f/6.9 imaging APO refractor telescope
  • Compact design perfect for imaging deep sky objects and planets
  • 1:10 rack-and-pinion focuser and Bahtinov mask for precise focus

The William Optics ZenithStar 103 mm f/6.9 imaging APO telescope boasts extreme sharpness, color correction, and no image shifting. A perfect, compact solution for imaging deep sky objects and planets--measuring in just over 2 feet in length.

A 2.5-inch rack-and-pinion focuser (1:10 dual-speed) and innovative Bahtinov mask cover are included for precision focusing. With an optional 0.8x flattener, this can become f/5.5--roughly doubling the amount of light gathering power and widening field of view. Solar observations possible with additional filter.

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  • Regular price $1,198.00

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William Optics ZenithStar 103 mm Refractor (Blue)

 What's Included:

  • Mounting rings
  • CNC carry handle bar
  • Long vixen-style dovetail plate
  • 2.5-inch rack-and-pinion focuser
  • Innovative Bahtinov mask focusing cover
  • Two-year, no-fuss warranty and constant customer service!

Optional Accessories (purchased separately):

  • Full frame 0.8x flattener for f/5.5 aperture and wider field of view
  • Solar filter
  • Guiding rings
  • 50 mm f/4 rotolock guide scope
  • M63 to 2-inch rotolock
  • 1.25-inch rotolock
  • Soft carry case



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