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William Optics Pleiades 111 f/4.8 6-Element Astrograph
William Optics Pleiades 111 f/4.8 6-Element Astrograph
William Optics Pleiades 111 f/4.8 6-Element Astrograph
William Optics Pleiades 111 f/4.8 6-Element Astrograph
William Optics Pleiades 111 f/4.8 6-Element Astrograph

William Optics Pleiades 111 f/4.8 6-Element Astrograph

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Product Code
Telescope Type
APO Sextuplet Refractor
Aperture (mm)
111 mm
Email us a question about this ProductWilliam Optics

William Optics Pleiades 111 f/4.8 6-Element Astrograph Apochromatic Refractor Telescope

The Pleiades 111 is a new and exciting astrograph from William Optics. Featuring a 6-element design with a built-in flattener, you get stunningly flat images across even full-frame sensors. It features a generous 111mm aperture while remaining in a portable tube. 


Spot diagrams:


We are using a new lens cell design in the WO Pleiades series telescopes. This design incorporates the use of high-quality FPL-53 glass for superior optical performance. Before storying your telescope, it is crucial to allow it sufficient time to acclimatise to room temperature. Please ensure that the telescope is thoroughly dry and free of moisture or dew before storing. This ensures the safety and longevity of the telescope's components. 

Always store the telescope in a consistent temperature and dry environment to prevent any potential damage to the optical elements. Remember to leave the tube uncovered and opened during the acclimatisation period. As always, taking appropriate care of your telescope will ensure its optimal lifespan.

Telescope diagram:

R&P Gear Spacing Screws

Adjust the focuser ONLY when necessary by progressively pushing and pulling the screws until you reach the desired smoothness. 

Note: Do not adjust without permission from ourselves or WO. 

Where is the tilt adapter? 

How to install EAF


Specifications: William Optics Pleiades 111 f/4.8 6-Element Astrograph

  • Focal length: 528mm
  • Aperture: 111mm
  • Focal ratio: f/4.8
  • Focuser: WIFD (WO Internal Focuser Design) (Compatible with EAF)
  • Image circle: >Full frame (45mm)
  • Retracted length: 645mm
  • Extended length: 785mm
  • Dew shield circumference: 493mm
  • Dew shield diameter: 155mm
  • Weight: 7.955kg / 17.54lbs (OTA Only), 10.315kg / 22.74lbs (OTA with ring, dovetail and saddle)


Back focus:


What's in the Box

What's in the Box: William Optics Pleiades 111 f/4.8 6-Element Astrograph

  • A: Dust cover with Bahtinov mask
  • B: Dew shield
  • C: Main tube
  • D: Saddle handle bar
  • E: Camera angle rotator
  • F: Tilt adapter
  • G: Losmandy-style dovetail mounting plate
  • H: M54 and M48 camera adapter
  • I: Soft carry case


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