William Optics  x0.72 Reducer /  Flattener for FLT132, GT102, GT153
 William Optics  x0.72 Reducer /  Flattener for FLT132, GT102, GT153William Optics  x0.72 Reducer /  Flattener for FLT132, GT102, GT153 

William Optics x0.72 Reducer / Flattener for FLT132, GT102, GT153

  (1 Review)
✓ 2 year warranty


Out of stock due 10-15 working days

About this product

Model:  wo-flat8
Part Number:  P-FLAT8

New William Optics Reducer / Flattener 8

This new WO x0.72 Reducer / Flattener was made for f6 - f7.5 ratio refractors and has been engineered and CNC machined for usage with our FLT 132, 102GTS and other APO refractors. This accessory is a must-have for refractor astrophotography.


  • ED Triplet 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: x0.72.
  • 45mm for full illuminated imaging circle.

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 FLT 132, 102GTS (with 3" focuser) and many other refractors with focuser M92x1.0 threads.

Flattener Adjustment Distances

102 GTS12.1mm
FLT 1328.4mm


Customer reviews

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Faster, larger imaging circle and OK performance.
Sunday, 16 August 2020  | 

I have a FLT132, fitted with a Feathertouch focuser and previously owned the FFIV reducer and the FF68 flattener. I sold the FFIV for this one, to obtain a slightly wider FOV and imaging circle. This is an expensive item and is built well, as you would expect. Used on an APS-C sensor, I found the amount of field curvature to be relatively insensitive to adjustment, a few mm either way made little difference (visually and using CCDInspector). I struggled to get a truly flat field however. Something that I could achieve with the FFIV. It is a heavy beast and the Feathertouch focuser is pretty robust. With an aligned camera, I still had some tilt and curvature. Stars in some corners were clearly slightly elongated.
Changing the spacing also rotates the camera, something to watch out for. It is a pain during the process to find the right spacing. (The FFIV did not rotate the camera and had a rotation device too).


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