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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.
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 65mm Extension Tube for ESATTO 3"

PrimaLuceLab 65mm Extension Tube for ESATTO 3"

by PrimaLuceLab
SKU PLL-PL3600284
$125.00 - $125.00
$125.00
$125.00 - $125.00
$125.00
Price Match Policy!
  • Adds 65mm of extension for ESATTO 3" focusers
  • Enables focus on telescopes with long-travel stock focusers
  • Integrated dovetail coupling system for manual rotation
  • Secured by 3 screws set at 120° for precise alignment
  • Designed for refractors and other long back-focus systems
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • PrimaLuceLab 65mm Extension Tube for ESATTO 3"

    The PrimaLuceLab 65mm Extension Tube is the essential mechanical adapter for integrating your ESATTO 3" robotic focuser with telescopes originally designed for long-travel focusers. This tube adds a fixed 65mm of optical path length, bridging the gap left when replacing a stock focuser that has more travel than the micrometric ESATTO. Its integrated dovetail coupling is secured by 3 screws set at 120° intervals, allowing you to manually rotate your entire imaging train for perfect composition.

    Achieve Focus: Adding 65mm for Long-Travel Telescope Designs

    The ESATTO 3" is a micrometric focuser, engineered for high-precision, short-travel adjustments. When installed on telescopes like refractors, which often come with stock focusers offering extensive travel, you may find it impossible to reach focus. This 65mm extension solves that problem by consuming the excess back focus, effectively moving your ESATTO 3" into the correct focal plane.

    360° Rotational Framing with a 3-Screw Dovetail System

    Beyond simply adding length, this extension provides a critical framing function. It features a precise dovetail coupling system that allows you to manually rotate the attached ESATTO 3" focuser. By loosening the 3 screws set at 120° around the collar, you can orient your camera to perfectly frame targets like the Andromeda Galaxy (M31) or the Veil Nebula complex without introducing tilt.

  • Why do I need the 65mm Extension Tube for my ESATTO 3"?

    You need this extension if you are installing an ESATTO 3" focuser on a telescope, typically a refractor, that originally had a focuser with a long drawtube. The ESATTO is a high-precision, short-travel focuser, and this 65mm tube compensates for the difference, ensuring you can reach focus with your camera and accessories.

    How does the rotation feature on the 65mm Extension Tube work?

    The extension features a dovetail coupling mechanism. By slightly loosening the three screws positioned at 120-degree intervals around the tube's collar, you can smoothly rotate the ESATTO 3" focuser and your entire imaging train. Once you achieve the desired orientation, you simply retighten the screws to lock it securely in place.

    Will the PrimaLuceLab 65mm extension introduce flexure into my imaging train?

    This extension is machined by PrimaLuceLab to match the high mechanical standards of the ESATTO 3" focuser. When correctly installed and tightened, it is designed to provide a rigid connection that minimizes flexure, even when supporting heavy imaging systems.

    Can I stack multiple 65mm extension tubes if I need more back focus?

    While mechanically possible, stacking extensions is generally not recommended as it can increase the risk of flexure and vignetting. It is best to use a single extension that is closest to the required length for your specific telescope and imaging setup.

    I'm installing an ESATTO 3" on my large refractor that needs a lot of out-travel. Is this 65mm extension my only option?

    PrimaLuceLab designed this 65mm extension specifically for this purpose. It provides a substantial length to accommodate most large refractors. If your setup requires a different length, you may need to investigate custom or alternative adapters, but this 65mm tube is the standard solution for bridging significant back-focus gaps with the ESATTO 3".

    When imaging the Horsehead Nebula (Barnard 33) with my ESATTO 3", how does the rotation on this 65mm tube help?

    The Horsehead Nebula has a distinct vertical orientation that often looks best when aligned with the long axis of a rectangular camera sensor. The rotation feature on the 65mm extension allows you to precisely orient your camera to frame the nebula and the nearby Flame Nebula (NGC 2024) aesthetically, ensuring you get the most compelling composition without having to rotate the entire optical tube in its rings.

  • PrimaLuceLab 1-Year Warranty