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PrimaLuceLab Adapter from M81 to M54 with Stop Ring for ESATTO 3"

PrimaLuceLab Adapter from M81 to M54 with Stop Ring for ESATTO 3"

by PrimaLuceLab
SKU PLL-PL3600275
CA$133.00 - CA$133.00
CA$133.00
CA$133.00 - CA$133.00
CA$133.00
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  • Connects M81 Threads to M54 Accessories
  • Adds a Minimal 4mm of Optical Path
  • Includes Stop Ring for Rotational Adjustment
  • Compatible with ESATTO 3" and ARCO 3"
  • Enables Precise Sensor Framing
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • PrimaLuceLab Adapter from M81 to M54 with Stop Ring for ESATTO 3"

    The PrimaLuceLab Adapter from M81 to M54 provides a secure, rigid connection for accessories with an M54 female thread to the M81 draw tube of an ESATTO 3" or ARCO 3" unit. Comprised of a 1.5mm adapter and a 2.5mm stop ring, this component adds a total optical length of just 4mm, preserving precious back focus in complex imaging trains.

    The 1.5mm Adapter: M81 to M54 Connection

    This adapter's primary function is to convert the large M81 male thread on the ESATTO 3" or ARCO 3" draw tube to the widely used M54 male thread. This allows you to directly attach a vast ecosystem of cameras, filter wheels, and off-axis guiders that rely on the M54 standard, ensuring a solid, threaded connection with no flexure.

    The 2.5mm Stop Ring for Precise Sensor Alignment

    The included 2.5mm stop ring is critical for achieving perfect framing. After threading the main adapter onto your focuser, you can back it off slightly to orient your camera sensor to the ideal angle. The stop ring is then tightened against the focuser body, locking the adapter in place and preventing any rotation during an imaging session.

  • What is the total optical length of the PrimaLuceLab M81 to M54 adapter?

    The total optical length is 4mm. This is composed of the main adapter body, which is 1.5mm thick, and the stop ring, which is 2.5mm thick.

    How does the stop ring on this PrimaLuceLab adapter help with framing a target like the Horsehead Nebula (B33)?

    The stop ring allows you to achieve precise rotational framing. You can thread the adapter on, then slightly unscrew it to perfectly align your camera's sensor with the orientation of the nebula. Once positioned, you tighten the stop ring against the ESATTO or ARCO body to lock that angle securely for the duration of your imaging run.

    Can I use this M81 to M54 adapter with the PrimaLuceLab ARCO 3" rotator?

    Yes, this adapter is fully compatible with both the ESATTO 3" robotic focuser and the ARCO 3" robotic rotator. It threads directly into the M81 port on either device.

    What is the main purpose of this adapter for my ESATTO 3" focuser?

    Its purpose is to provide a threaded connection for cameras and accessories that use the common M54 female thread. The ESATTO 3" has a native M81 thread, and this adapter bridges that gap, allowing you to attach your M54-compatible imaging equipment.

    My camera has an M54 female thread. Will this PrimaLuceLab adapter connect it to my ESATTO 3"?

    Yes, this is the correct adapter. It presents a male M54 thread that will connect directly to your camera's M54 female thread, creating a secure, all-threaded imaging train.

    I'm connecting a camera with an M54 thread to my ESATTO 3" on a Ritchey-Chretien telescope. Is this the right part?

    Yes, this adapter is designed for exactly that scenario. It allows you to securely attach your M54-threaded camera to the ESATTO 3" focuser commonly used on Ritchey-Chretien, Cassegrain, and large refractor telescopes.

  • Input Thread M81
    Output Thread M54
    Compatibility ESATTO 3", ARCO 3"
    Total Optical Length 4mm
    Adapter Optical Length 1.5mm
    Stop Ring Optical Length 2.5mm

    • Adapter from M81 to M54 with Stop Ring

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  • This product does not require specific software or a dedicated manual.

  • PrimaLuceLab 1-Year Warranty