William Optics

Used ZenithStar 81 f/6.9 Doublet APO

SKU: U2311-DP-A-Z81RD-AP

  • Sale
  • $599.95
  • Regular price $888.00

Qualifies Towards Free Ground Shipping (CONUS Only) For Most Orders Of $79 Or More

Not Returnable Please note that used items are not returnable.

This is a ZenithStar 81 in excellent condition.  Both the optics and body are clean, although there is a tiny mark on the tube.  This comes in its original soft-lined foam case, and includes a camera rotator.  This item can be shipped.  


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