William Optics 0.8x Reducer / Adjustable Field Flattener 6AII for Z71, GT71, GT81, Z103, & Z126 Telescopes # P-FLAT6AII

Our Price: $198.00
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Manufacturer SKU: P-FLAT6AII
Item Can Ship: Worldwide
William Optics 0.8x Reducer / Adjustable Field Flattener 6AII for Z71, GT71, GT81, Z103, & Z126 Telescopes # P-FLAT6AII

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Product Details

This very elegant 2" reducer/field flattener has been designed to optimize the flat-field imaging performance of William Optics F/6 to F7.5 ratio refactors. WO Flat 6All will provide good illumination and flat field across 97% of full frame sized sensors.

Full frame size 

  • Designed with nearly full frame chip-size DSLR cameras in mind. 
  • FMC triplet APO design.
  • Produced entirely with the best Ohara optical glasses. 


  • Reducing factor 0.8X.
  • Adjustable design, for perfect back focus it can be used with other models of refractors

Superb Finish

  • William Optics polished anodized finish.
  • All internal surfaces threaded and blackened to prevent reflections.

Easy to Use  

  • Will accept any standard 48mm T-ring for your camera (not for use with 42mm T rings)
  • Weighs 15.3oz

Suitable For

  • Z71, GT71, GT81, Z103, Z126

Adjustment Distance

  • Z71: 11.8mm
  • GT71: 9.3mm
  • GT81: 7.9mm
  • Z103: 4.6mm
  • Z126: 1.4mm
  • Graduated millimeter scale on the flattener allows you to set the correct spacing distance for your telescope. A lock ring securely holds the spacing distance in place.

How to Attach Flat6AII to Telescopes

  • This flattener/reducer does NOT come with a standard 2" nospiece (sold separately if required)
  • On the telescope side, this flattener features an M63 male thread as well as an M48x0.75 female thread.
  • Some William Optics telescopes have an M63 female thread on the eyepiece side. This flattener/reducer can be screwed directly into those telescopes without any modification or additional parts. In this configuration, the M48 female thread on the flattener/reducer can also accept a 2" astronomical filter.
  • However, for use with 2" focuser drawtubes, you need to purchase and attach the William Optics DIG2A 2" nosepiece (or equivalent) to the M48 female thread of the flattener/reducer. In this configuration, you cannot attach 2" filters to the flattener, although you can attach one to the 2" nosepiece.

Additional Information

A. How to Attach Flat6AII to Telescopes

For Telescope with 2" Focuser Drawtube / M63 Thread

For Telescope without M63 Female Thread

B. How to Adjust Flattener Distance