William Optics

ZenithStar 81 f/6.9 Doublet AP Package w/ 0.8x Flattener


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  • $1,050.00
  • Regular price $1,150.00

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The William Optics ZenithStar 81 mm aperture Doublet APO Refactor is an extremely versatile telescope, ideal for both astrophotography and general photography. It provides a sharp image for any DSLR, and pristine clarity for both visual observers and astrophotographers. This scope series is even capable of handling full frame sensors.

This air-spaced 81 mm series utilizes FPL-53 glass to provide clear detail and sharp colors. Similar to past models, this series also includes a 10:1 dual speed, 2.5-inch, R&P ultra-robust focuser. 

 William Optics has crafted this series as an f/6.9 for respectable speed. On top of that, each scope in the series comes with a built-in, removable, clear Bahtinov mask for convenience in focusing. 

These OTAs include a dual-side dovetail compatible with Vixen and Arca Swiss stylings.

  • 0.8x Flattener/Reducer
  • Mounting Rings 
  • CNC Carry Handle Bar 
  • 2.5" Rack & Pinion Focuser 
  • Dual Sided Dovetail 
  • Bahtinov Mask
  • Carry Case
  • Aperture: 81mm
  • Glass:  FPL-53
  • Focal Length: 559mm
  • Focal Ratio: f/6.9
  • Focuser: 2.5" Rack & Pinion Dual Speed Focuser
  • Tube Length: 460mm (Fully Retracted) and 560mm (Fully Extended)
  • Total Weight: 3.53kg (7.78 lb)
  • Image Circle:  Full frame
  • Warranty:  William Optics 2-year