Skip to content
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 M56 15mm Extension Tube for ESATTO 2"

PrimaLuceLab M56 15mm Extension Tube for ESATTO 2"

by PrimaLuceLab
SKU PLL-PL3600286
$45.00 - $45.00
$45.00
$45.00 - $45.00
$45.00
Price Match Policy!
  • Provides a fixed 15mm extension for precise back focus
  • Designed specifically for the PrimaLuceLab ESATTO 2" focuser
  • Features M56 male and female threads for direct connection
  • Durable, black anodized aluminum construction
Backordered
Request Stock Alert
Availability Info
Qualifies for FREE Shipping in CONUS on orders over $350.
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • PrimaLuceLab M56 15mm Extension Tube for ESATTO 2"

    The PrimaLuceLab M56 15mm Extension Tube provides a fixed 15mm of spacing, allowing you to achieve the correct back focus with your ESATTO 2" robotic focuser. It threads directly onto the ESATTO 2" draw tube's M56 threads, enabling a secure connection to camera adapters and other accessories in your imaging train.

    Achieve Precise 15mm Spacing for the ESATTO 2" Focuser

    When your imaging train—composed of components like an off-axis guider, filter wheel, or adaptive optics unit—requires more back focus than your telescope provides, a rigid extension is essential. This tube adds exactly 15mm of length, allowing you to correctly position your camera sensor at the focal plane without over-extending the focuser's drawtube, which preserves mechanical rigidity and minimizes potential tilt.

    M56 Threads for Seamless PrimaLuceLab Ecosystem Integration

    Engineered to integrate perfectly with PrimaLuceLab hardware, this extension features male M56 threads on one side to connect to the ESATTO 2" draw tube and female M56 threads on the other. This allows you to attach any of PrimaLuceLab's ESATTO 2" camera adapters or the 2" visual back. The black anodized aluminum construction ensures durability and matches the finish of other PrimaLuceLab components.

  • When do I need the PrimaLuceLab M56 15mm Extension Tube?

    You need this 15mm extension tube when your camera and accessories require a specific back focus distance that cannot be reached with your standard setup. It's commonly used to push the camera sensor further away from the focuser to accommodate reducers, flatteners, or off-axis guiders that have strict spacing requirements.

    How does this 15mm extension connect to the ESATTO 2" focuser?

    The extension tube threads directly onto the M56 male thread of the ESATTO 2" focuser's draw tube. The other side of the extension provides an M56 female thread, allowing you to connect your existing ESATTO 2" camera adapters or other M56-threaded accessories.

    Can I stack multiple M56 15mm extension tubes?

    Yes, you can thread multiple extensions together to create longer spacing (e.g., two tubes for 30mm). However, be mindful that each added connection increases the length of the imaging train, which can introduce flexure. For longer distances, a single, longer extension is generally preferred for maximum rigidity.

    Is this M56 extension compatible with focusers other than the ESATTO 2"?

    While it is designed specifically for the PrimaLuceLab ESATTO 2", it may be compatible with other focusers or accessories that use a standard M56 x 1mm thread. However, compatibility and correct spacing are only guaranteed within the PrimaLuceLab ecosystem.

    Will the M56 15mm extension help me reach focus with an OAG on my Sky-Watcher Esprit 100?

    Yes, this is a perfect use case. An off-axis guider (OAG) often consumes significant back focus. If adding your OAG and camera to the ESATTO 2" on your Esprit 100 leaves you short of the required spacing, this 15mm extension can provide the extra distance needed to bring both the main camera and guide camera to a sharp focus.

    Why use this 15mm extension instead of just extending the ESATTO 2" draw tube?

    Using a fixed extension keeps the focuser's draw tube more retracted. A more retracted draw tube is mechanically stiffer and less prone to tilt or sag, especially with a heavy imaging payload. This M56 15mm extension ensures your focuser operates in its most rigid range, improving the overall stability of your optical system.

  • Product Type Extension Tube
    Extension Length 15mm
    Compatibility PrimaLuceLab ESATTO 2" Focuser
    Threads M56 x 1mm (Male and Female)
    Material Black Anodized Aluminum
  • PrimaLuceLab 1-Year Warranty