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Explore Scientific 3" .7x Focal Reducer & Field Flattener for APO Refractors

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  • $319.99
  • Regular price $399.99

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  • Reduces focal ratio to 70-percent of its standard value ( 0.7x)
  • Corrects Edge-of-Field aberrations
  • Barrel Size: 3-inch


Explore Scientific 3" .7x Focal Reducer & Field Flattener for APO Refractors

The 3-Inch Focal Reducer and Field Flattener by Explore Scientific is a versatile accessory made to augment your astrophotography adventure. As a field flattener, this accessory will take care of annoying edge-of-field aberrations brought about by curved focal planes, resulting in clear, sharp images. As a focal reducer, this accessory will reduce your focal ratio by 0.7 for a wider field of view and increased image illumination in shorter exposure intervals.

Explore Scientific recommended this accessory for their 127 mm and 152 mm APO refractors. Features fully multi-coated optics and comes with a 3-inch Nosepiece, 2 adapters for various focuser sizes and a male T-thread adapter for the camera.

OPT Product Number: ES-FFFR507X-00


Accessory TypeReducer/Extender & or Corrector Accessory
Free ShippingYes
ManufacturerExplore Scientific


  • 3-inch .7x Focal Reducer & Field Flattener
  • 3-inch Nosepiece Adapter
  • 2 adapters for various focusers
  • T-Thread Adapter