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PrimaLuceLab Adapter ESATTO 3.5" LP for telescopes with Large 3.3" SC Thread

PrimaLuceLab Adapter ESATTO 3.5" LP for telescopes with Large 3.3" SC Thread

by PrimaLuceLab
SKU PLL-PL3600362
CA$133.00 - CA$133.00
CA$133.00
CA$133.00 - CA$133.00
CA$133.00
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  • Connects ESATTO 3.5" LP focuser to large-format Celestron telescopes
  • Designed for the 3.3" rear cell thread on select SCT and EdgeHD models
  • Low-profile design preserves critical backfocus for imaging accessories
  • Ensures a secure, rigid, all-threaded connection
  • Compatible with the Celestron EdgeHD .7x focal reducers for 925, 1100 and 1400 models
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • PrimaLuceLab Adapter ESATTO 3.5" LP for Telescopes with Large 3.3" SC Thread

    This PrimaLuceLab adapter creates a direct, secure threaded connection between the ESATTO 3.5" LP robotic focuser and the large 3.3-inch rear cell of Celestron's larger Schmidt-Cassegrain and EdgeHD telescopes. It is engineered specifically for imagers who need to add a high-precision focuser without sacrificing critical backfocus. The adapter's minimal optical thickness is essential for building a rigid imaging train that can accommodate accessories like filter wheels and off-axis guiders, especially when using a focal reducer.

    Seamless Integration with Celestron 11" and 14" Telescopes

    This adapter is the key to upgrading your large Celestron telescope with the PrimaLuceLab ESATTO 3.5" LP focuser. It replaces the standard visual back, threading directly onto the large 3.3-inch port found on Celestron SCT 11" and 14" models, as well as EdgeHD 925, 1100, and 1400 optical tubes.

    Preserving Backfocus with the Celestron .7x Reducer

    Backfocus is a finite and critical resource, particularly on SCT and EdgeHD systems using a focal reducer. The adapter has only 2mm of optical thickness. Combined with the 32mm-deep ESATTO 3.5" LP, this leaves 112mm of backfocus for your camera and accessories, also when used with the Celestron EdgeHD .7x focal reducers for the 925, 1100 and 1400 models. You can add the precision of the ESATTO focuser without compromising your ability to reach focus with a full imaging setup.

  • Which Celestron telescopes is the PrimaLuceLab ESATTO 3.5" LP adapter compatible with?

    This adapter is specifically designed for the large 3.3-inch rear thread found on Celestron SCT (11" and 14") and EdgeHD (925, 1100, and 1400) models. It is not compatible with smaller telescopes that use the standard 2-inch SC thread.

    Can I use this ESATTO 3.5" LP adapter with my Celestron EdgeHD 1100 and the .7x focal reducer?

    Yes. The adapter has only 2mm of optical thickness, and with the ESATTO 3.5" LP it leaves 112mm of backfocus for your camera and accessories, also when using the Celestron .7x focal reducer for the EdgeHD 1100.

    What is the main benefit of using this specific PrimaLuceLab adapter for my ESATTO 3.5" LP?

    The primary benefit is achieving a rigid, all-threaded connection while consuming the least amount of backfocus possible. This prevents optical train flexure and ensures you can reach focus with a full imaging setup that includes a filter wheel, off-axis guider, and camera.

    Does this adapter connect to the standard 2" SC thread found on smaller Celestron scopes?

    No, this adapter is exclusively for the large 3.3" SC thread. It will not fit the smaller, more common 2" thread found on Celestron SCTs 9.25" and smaller.

    I want to add an ESATTO 3.5" LP focuser to my Celestron 14" SCT for imaging galaxies like the Whirlpool Galaxy (M51). Is this the correct adapter?

    Yes, this is the exact adapter required to connect the ESATTO 3.5" LP focuser to the 3.3" thread on your Celestron 14" SCT. It will provide the secure mounting and backfocus preservation needed for deep-sky astrophotography.

    What problem does the low-profile design of this ESATTO 3.5" LP adapter solve?

    It solves the common problem of running out of backfocus. Adding a focuser, filter wheel, and off-axis guider can easily exceed the available backfocus on an SCT, especially with a focal reducer. This adapter's minimal thickness ensures these components can fit within the optical path while still achieving sharp focus.

  • Kind Focuser adapter
    Telescope-side connection Large 3.3" SC thread
    Camera-side connection ESATTO 3.5" LP focuser
    Optical length (added light path) 2 mm
  • PrimaLuceLab 1-Year Warranty