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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.
ZWO EOS Lens Adapter for 2" EFW
ZWO EOS Lens Adapter for 2" EFW

ZWO EOS Lens Adapter for 2" EFW

by ZWO
SKU ZWO-EFW2-EOS
$49.00 - $49.00
$49.00
$49.00 - $49.00
$49.00
Price Match Policy!
  • Connects Canon EOS lenses to a ZWO 2" Electronic Filter Wheel
  • M54x0.75 female thread for direct, secure attachment
  • Enables filtered, wide-field astrophotography with DSLR lenses
  • Engineered specifically for the larger 2" ZWO EFW models
1 in stock
Qualifies for FREE Shipping in CONUS on orders over $350.
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • ZWO EOS Lens Adapter for 2" EFW

    The ZWO EOS Lens Adapter for 2" EFW (ZWO EFW2-EOS) provides the essential link between your Canon EOS-mount lenses and a ZWO 2-inch Electronic Filter Wheel. It features a robust M54x0.75 female thread designed specifically for the larger 2" filter wheel body, enabling you to capture wide-field celestial images through your choice of filters.

    M54x0.75 Thread for 2" Filter Wheels

    This adapter is built around the M54x0.75 thread standard used on ZWO's 2" EFW. This larger-diameter connection is critical for minimizing vignetting when pairing full-frame camera lenses with ZWO cameras that have large sensors. The secure, threaded interface ensures your imaging train remains perfectly collinear and free of light leaks throughout an imaging session.

    Installation and Compatibility with your 2" EFW

    Proper installation requires a direct connection to the ZWO 2" EFW. To achieve this, you must first remove the sensor tilt adapter plate that comes attached to your ZWO camera. This ensures the correct spacing and a flush fit between the filter wheel and the camera body.

    • Required EFW: This adapter is exclusively compatible with the ZWO 2" Electronic Filter Wheel.
    • Incompatible EFWs: It is not mechanically compatible with the smaller ZWO 1.25", 31mm, or 36mm filter wheels, which use a different thread size.

    ZWO EFW2-EOS vs. ZWO-EOS-T2 Adapter

    ZWO produces two primary EOS lens adapters for its filter wheels, and choosing the correct one is critical. The key difference is the rear connection thread, which dictates which filter wheel it can attach to.

    • ZWO EFW2-EOS (This Model): Features a large M54x0.75 thread designed for the 2" EFW. This is the correct choice for larger sensors and 2" filters to avoid clipping the light path.
    • ZWO-EOS-T2 Adapter: Uses a smaller M42x0.75 (T2) thread. This version is designed for the 1.25", 31mm, and 36mm EFWs, which are typically paired with cameras that have smaller APS-C or Four Thirds sensors.

  • What do I need to connect my Canon EOS lens to a ZWO 2" EFW?

    You need this specific adapter, the ZWO EOS Lens Adapter for 2" EFW (SKU: ZWO-EFW2-EOS). It has the correct M54x0.75 thread to attach directly to the 2" filter wheel.

    Will this ZWO EOS adapter work with my ZWO 36mm EFW?

    No. This adapter is exclusively for the ZWO 2" EFW. The ZWO 36mm, 31mm, and 1.25" filter wheels require the ZWO-EOS-T2 adapter, which uses a smaller M42 thread.

    Do I need to modify my ZWO camera to install the EFW2-EOS adapter?

    Yes, a minor adjustment is required. You must remove the sensor tilt adapter that comes pre-installed on the front of your ZWO cooled camera. This allows the camera to connect flush with the back of the 2" EFW.

    Can I use this adapter to image the Orion Nebula (M42) with my ZWO ASI2600MC Pro camera?

    Absolutely. This adapter is the ideal component for that setup. It allows you to connect a wide-angle Canon EOS lens to your 2" EFW, which would house your filters (like a dual-band filter), and then thread directly to your ASI2600MC Pro (after removing its tilt plate). This creates a powerful wide-field imaging rig perfect for large targets like the Orion Nebula (M42).

    Why does this adapter use an M54x0.75 thread instead of a standard T2 thread?

    The larger M54x0.75 thread is necessary to match the opening of the 2" EFW. A smaller T2 (M42x0.75) thread would create a bottleneck in the light path, causing significant vignetting (darkened corners) on cameras with large sensors, especially when using full-frame EOS lenses.

    What is the warranty on the ZWO EFW2-EOS adapter?

    This ZWO adapter is covered by a 2-year manufacturer warranty, ensuring it is free from defects in materials and workmanship.

  • SKU Number ZWO-EFW2-EOS
    Filter Wheel Product Type Filter Wheel Adapter
    Warranty ZWO - 2 Years

    • EOS Lens Adapter for 2" EFW

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  • ZWO 2-Year Limited Warranty