William Optics FLAT6AIII Adjustable Field Flattener

Product Details

• Description
• Specifications
• Included Items
• Recommended Products
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• The William Optics Adjustable Field Flattener improves the flat-field imaging performance of William Optics GT71, GT81, Z81, and Z103 refractors. 

  Features of the William Optics Adjustable Field Flattener

  • APO triplet optics made with Ohara glass. 
  • Fully multi-coated to provide bright and flat field across 97% of full-frame sensors.
  • Built with M63 threads on the telescope side.

   

  The following telescope models can be used with the William Optics FLAT6AIII Adjustable Field Flattener

  • Amount of Adjustment:
  • GT71 - 9.1mm
  • GT71 - 9.1mm
  • GT81 - 7.1mm
  • Z103 - 2.5mm
  • Z81 - 5.2mm

  • Back Focus:
  • GT71 - 64.1mm
  • GT71 - 9.1mm
  • GT81 - 62.1mm
  • Z103 - 57.5mm
  • Z81 - 60.2mm

  • Image Circle:
  • GT71 - 44mm
  • GT71 - 9.1mm
  • GT81 - 44mm
  • Z103 - 43mm
  • Z81 - 44mm

• specifications

  Free Shipping

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• included items

  • Refine your flat-field performance.
  • Fully multi-coated Ohara glass optics.
  • Reducing factor: 0.8X.