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IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
PrimaLuceLab Adapter ESATTO 2" for Telescopes with Large 3.3" SC Thread

PrimaLuceLab Adapter ESATTO 2" for Telescopes with Large 3.3" SC Thread

by PrimaLuceLab
SKU PLL-PL3600212
$65.00 - $65.00
$65.00
$65.00 - $65.00
$65.00
Price Match Policy!
  • Connects ESATTO 2" focuser to large 3.3" SC threads
  • Designed for Celestron 9.25", 11", and 14" SCT & EdgeHD telescopes
  • Ultra-thin 2mm optical thickness consumes minimal backfocus
  • Leaves 77mm of backfocus available for your imaging train
  • Compatible with Celestron's 0.7x focal reducers for EdgeHD models
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • PrimaLuceLab Adapter ESATTO 2" for Telescopes with Large 3.3" SC Thread

    The PrimaLuceLab Adapter for ESATTO 2" creates a secure, threaded connection between your robotic focuser and the large 3.3" rear cell port on Celestron 9.25", 11", and 14" SCT and EdgeHD telescopes. With an ultra-thin 2mm optical thickness, this adapter preserves a critical 77mm of backfocus, ensuring you have ample space for a full imaging train including off-axis guiders, filter wheels, and cameras, even when using a 0.7x reducer.

    Securely Connect Your ESATTO 2" to Large Celestron 3.3" SCTs

    This adapter is the essential component for integrating the ESATTO 2" microfocuser with Celestron's larger Schmidt-Cassegrain and EdgeHD telescopes. It threads directly onto the 3.3" rear cell, providing a rigid, non-flexing foundation for your entire imaging system. This eliminates the instability that can arise from stacked, generic adapters, ensuring your focuser and camera are perfectly aligned with the telescope's optical axis.

    Maintain 77mm of Backfocus with a 2mm Optical Profile

    Backfocus is a critical resource, especially when using focal reducers. The ESATTO 2" focuser has a body depth of 67mm, and this adapter adds only 2mm to the optical path. This minimal profile is crucial for leaving 77mm of available backfocus for your equipment. You can confidently assemble a complete imaging train for your EdgeHD 925, 1100, or 1400, including the Celestron 0.7x reducer, without running out of spacing.

  • What telescopes is the PrimaLuceLab 3.3" SC adapter compatible with?

    This adapter is specifically designed for Celestron telescopes that use the large 3.3" rear cell thread. This includes the Celestron SCT (11" and 14") and EdgeHD (9.25", 11", and 14") models.

    How much backfocus will I have left after installing the ESATTO 2" with this 3.3" SC adapter?

    You will have 77mm of available backfocus. The ESATTO 2" focuser itself has a 67mm body depth, and this adapter adds only 2mm of optical thickness, consuming a total of 69mm from your telescope's native backfocus distance.

    Can I use this PrimaLuceLab 3.3" adapter with the Celestron 0.7x focal reducer on my EdgeHD 1100?

    Yes. This adapter is designed to work perfectly with the Celestron EdgeHD 0.7x focal reducers for the 9.25", 11", and 14" models. The 77mm of remaining backfocus is sufficient to accommodate the reducer's required spacing along with your other imaging accessories.

    Why do I need this specific adapter for my Celestron 14" SCT?

    The Celestron 14" SCT uses a large 3.3" thread on its rear cell, which is different from the standard 2" SC thread found on smaller models. This PrimaLuceLab adapter provides the correct threading for a direct, secure attachment of the ESATTO 2" focuser, ensuring a stable and perfectly aligned connection.

    Does this adapter add any flexure to my imaging train?

    No. As a single, machined piece that threads directly onto the telescope and the focuser, this adapter is designed to be a rigid component of your optical train. It eliminates a common source of flexure that can occur when stacking multiple smaller adapters to achieve the same connection.

    I have a Celestron 8" EdgeHD, is this the right adapter for my ESATTO 2"?

    No, this adapter is not correct for an 8" SCT or EdgeHD. Those telescopes use a smaller, standard 2" SC thread. You will need the PrimaLuceLab "Adapter ESATTO 2" for telescopes with SC thread" (PL3600210) for that model.

  • Connection to Focuser PrimaLuceLab ESATTO 2"
    Connection to Telescope Large 3.3" SC Thread
    Optical Thickness 2mm
    Compatible Telescopes Celestron SCT (11", 14") & EdgeHD (9.25", 11", 14")
    Resulting Backfocus (with ESATTO 2") 77mm

    • Adapter ESATTO 2" for Telescopes with Large 3.3" SC Thread

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  • PrimaLuceLab 1-Year Warranty