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Home > Astrophotography > Optical accessories > Flatteners, Correctors, Reducers > William Optics > William Optics Adjustable Flattener Reducer Flat6A II

This product is no longer stocked and therefore cannot be purchased until further notice.

William Optics Adjustable Flattener Reducer Flat6A II

Product no.: 58563
Manufacturer: William Optics

$ 294.00

incl. VAT
William Optics Adjustable Flattener Reducer Flat6A II
William Optics Adjustable Flattener Reducer Flat6A II
William Optics Adjustable Flattener Reducer Flat6A II
Product description
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Product description:

In the case that this article currently is not available from the warehouse, please note the following: we order from this supplier in regular intervals. Please place your order now, so that we may take into account your order and deliver the article to you by the above-mentioned date. If you need the article earlier, we can rush it for you for an additional price. In this case, please contact our customer service department.

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. It 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 tripllet 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 refractor
  • 48mm filter ready

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.

Suitable for: GT71, GT81, Z81, Z103, Z126 (GT = Gran Turismo, Z = ZenithStar)

You have to adjust the flattener to your telescope:

  • GT71: 7.1mm
  • GT81: 5.1mm
  • Z81: 3.2mm
  • Z103: 0.5mm

The pictures on the right shows how this is done: Just turn the flattener until the scale shows the correct distance, than look it with the looking ring.

How to install the flattener? The flattener comes with an M63 thread. You just have to unscrew the 2"-Adapter out of the tube and screw the flattener inside.

Adjust the distance.
Lock the distance with the screw.
If the tube has an M63 thread, you can screw in the flattener directly.
Usage of the optional WD-DIG2A Adapter

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