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Explore Scientific 2" Field Flattener for Explore Scientific ED APO Telescopes

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Brand Explore Scientific
Part Number FFEDAPO-00
Availability available

Product Info

Manufacturer Description

Explore Scientific 2" Field Flattener for Explore Scientific ED APO Telescopes. Item # FFEDAPO-00.

A curved focal plane is an inherent feature in most telescope designs and is nothing to note for general stargazers. But, for astrophotographers, the consequences of that same curved plane can ruin hours of patient imaging. Designed for refracting telescopes, Explore Scientific’s Field Flattener can tackle the edge-of-field aberrations caused by this necessary curvature to ensure your long night at the eyepiece will not be in vain. This accessory offers fully multi-coated,  edge-blackened optics and slides securely into the 2” eyepiece holder.

Optimized to work with Explore Scientific's f/6 - f/7 ED Apo refractor telescopes. Features a standard 2" nosepiece (with M48 filter threads) on the telescope side and a male T / T2 thread on the camera side. Does not come with end caps.

Important Note: The working distance of this flattener is 45mm. Hence, this item is designed to work directly with most astronomical CCD cameras (from companies like SBIG, FLI, Apogee, QSI, ATIK, etc.) that have a female T thread for attachment to a telescope. This item is not designed to be used with DSLR cameras using standard 10mm long T rings. Very low profile T rings for Canon and Nikon DSLRs will be available from Explore Scientific soon (sold separately) that will enable DSLR owners to use this ES flattener.


  • Total length = 1.87" / 47.5mm
  • Length of male T thread = 0.17" / 4.2mm (threads only); 0.21" / 5.4mm (thread with shoulder)
  • Optical length (assuming nosepiece and T threads are fully engaged) = 0.44" / 11.1mm
  • Working distance = 1.77" / 45mm
  • Length of 2" nosepiece = 1.22" / 31mm
  • Maximum width = 2.08" / 52.9mm
  • Weight = 4.3oz


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