William Optics Adjustable Field Flattener 68III # P-FLAT68III

Our Price: $598.00
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In Stock (2 Available)
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Manufacturer SKU: P-FLAT68III
Item Can Ship: Worldwide
William Optics Adjustable Field Flattener 68III # P-FLAT68III

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Product Details

This revolutionary new WO FF68II Adjustable Flattener was made for 6 -7.5 F ratio refractors.

This high-quality flattener has been engineered and CNC machined for usage with our FLT 98, 110, 132, GT102 and other APO refractors.

This accessory is a must-have for refractor astrophotography.


  • Designed to cover full size DSLR cameras with clear lens aperture of 50 mm 
  • STM coated with an excellent doublet air spaced design. 
  • Produced entirely with the best Ohara optical glasses.
  • Flattener Power: 1x (no reduction).
  • 45mm for full illuminated imaging circle.


  • It will flatten the field amazingly well and finally make you see those stars round! 
  • This unique flattener works with WO or other 6-7.5 F ratio refractors.

Superb Finish

  • Superb William Optics anodized finish. 
  • All internal surfaces threaded and blackened for no reflections. 
  • Protecting covers are included on both sides.

Easy to Use

  • Will accept any standard T-ring for your camera (thread size M48x0.75). 
  • Suitable for FLT98, FLT110, FLT132, GT102 (with 3" focuser) and many others refractors with focuser M92x1.0 thread.


  • Adjustment distance for 102GTS: 13.6mm
  • Adjustment distance for FLT132: 7.7mm
  • Adjustment distance for GT153: 2.8mm
  • Weight: 820g / 29oz.

Useful Resources


Flattener Installation

T-Ring Installation

Adjusting Distance