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Explore Scientific Adapter for FFFR507X-00 to 2.5" Hex Focuser
Explore Scientific Adapter for FFFR507X-00 to 2.5" Hex Focuser

Explore Scientific Adapter for FFFR507X-00 to 2.5" Hex Focuser

by Explore Scientific
SKU ES-510366
CA$139.99 - CA$139.99
CA$139.99
CA$139.99 - CA$139.99
CA$139.99
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  • Dedicated Compatibility: Connects the Explore Scientific 3" 0.7x Reducer/Corrector (FFFR507X-00) to any telescope using the 2.5" Hex Focuser.
  • Imaging Enhancement: Unlocks the wider, faster f-ratio imaging capabilities of the 0.7x corrector for telescopes not equipped with a native 3" focuser.
  • Secure Connection: Precision-machined to provide a rigid, flex-free link between your focuser and the heavy-duty corrector, maintaining optical alignment.
  • Essential Component: The specific, proprietary adapter required to mate these two Explore Scientific components.
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • Explore Scientific Adapter for FFFR507X-00 to 2.5" Hex Focuser

    This Explore Scientific Adapter provides the essential mechanical link to connect the 3" 0.7x Field Flattener/Reducer Corrector (model FFFR507X-00) to telescopes equipped with the popular 2.5" Hex Focuser. This robust, single-piece adapter bridges the format gap, allowing you to take full advantage of the corrector's wide, flat field and focal reduction on a broader range of Explore Scientific instruments.

    Bridge Your 2.5" Hex Focuser to the 3" 0.7x Corrector

    Many Explore Scientific telescopes feature the excellent 2.5" Hex Focuser, but to achieve the widest, most corrected astrophotography fields, the 3" 0.7x corrector is the ideal accessory. This adapter provides the precise threading and spacing required to mount the larger corrector securely onto the 2.5" focuser drawtube, ensuring a rigid, non-flexing connection critical for sharp, round stars across the entire frame.

  • What is the purpose of this Explore Scientific Adapter?

    This adapter allows you to attach the Explore Scientific 3" 0.7x Reducer/Corrector (FFFR507X-00) to an Explore Scientific telescope that has a 2.5" Hex Focuser. It converts the threading and diameter to create a secure mechanical connection between these two parts.

    Which Explore Scientific telescopes require this adapter to use the 3" 0.7x corrector?

    Any Explore Scientific telescope equipped with the 2.5" Hex Focuser will require this adapter to use the FFFR507X-00 corrector. This includes many models in the ED APO Triplet Refractor series, such as the ED80, ED102, and ED127, that were shipped with the 2.5" focuser.

    Will this adapter cause vignetting when imaging M31 with a full-frame DSLR on an ES127?

    This adapter is designed to facilitate the optical path of the FFFR507X-00 corrector, which itself is engineered for large sensors. While any optical train can have some illumination fall-off, this adapter is not the limiting factor. The corrector itself is the primary determinant of the usable image circle, and when properly spaced, it should provide good coverage for full-frame sensors with only minor, flat-frame-correctable vignetting at the extreme corners.

    How do I install this adapter on my 2.5" Hex Focuser?

    Installation is straightforward. You typically unthread the standard 2" eyepiece holder from the end of the 2.5" focuser drawtube. This adapter then threads directly onto the exposed male threads of the drawtube, providing the correct female threads to accept the FFFR507X-00 corrector.

    Does this adapter change the back focus of the FFFR507X-00 corrector?

    No, this adapter is purely a mechanical converter. The required back focus distance for the FFFR507X-00 corrector (measured from the corrector's rear flange to the camera sensor) remains the same. This adapter simply allows you to achieve that connection on a 2.5" focuser.

    Can I use this adapter to connect other 3" accessories to my 2.5" Hex Focuser?

    This adapter is specifically designed for the Explore Scientific FFFR507X-00 3" 0.7x Corrector. While it may physically thread onto other accessories with the same thread pattern, proper spacing and optical compatibility are not guaranteed. It is only certified for its intended purpose.

  • GTIN 812257018871

    • Adapter for FFFR507X-00 to 2.5" Hex Focuser

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  • Explore Scientific Warranty