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July 1st: Store will be closed for Canada Day. Orders placed that day will ship on July 2nd.
ZWO Filter Drawer for EOS Lens
ZWO Filter Drawer for EOS Lens
ZWO Filter Drawer for EOS Lens

ZWO Filter Drawer for EOS Lens

by ZWO
SKU ZWO-FD-EOS
CA$139.00 - CA$139.00
CA$139.00
CA$139.00 - CA$139.00
CA$139.00
Price Match Policy!
  • Connects Canon EOS lenses to ZWO ASI cameras
  • Accepts standard 2" mounted filters
  • Magnetic holder for secure, fast filter changes
  • Adds 26.5mm of optical thickness
  • M42x0.75 camera-side thread
1 in stock
Qualifies for FREE Shipping in Canada on orders over $500.
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • ZWO Filter Drawer for EOS Lens

    The ZWO Filter Drawer for EOS Lens creates the critical link between your Canon EOS lenses and ZWO ASI cooled cameras, enabling the use of 2" mounted filters within a minimal 26.5mm optical path. It is engineered specifically for ASI cameras with 17.5mm of back focus and connects via a standard M42x0.75 thread, allowing you to turn your high-quality DSLR lenses into true astrographs for narrowband or light pollution imaging.

    Integrate 2" Filters with Canon EOS Lenses

    This drawer solves the primary challenge of using DSLR lenses for serious astrophotography: adding filtration. By accepting a standard 2" mounted filter, you can now use your EOS or EF-S lenses with multi-bandpass nebula filters or aggressive narrowband filters to capture high-contrast images of emission nebulae like the North American Nebula (NGC 7000) from light-polluted skies.

    Magnetic Holder for a 26.5mm Optical Path

    The core of the design is a magnetic slide-in holder that secures the 2" filter with no threads to cross or jam in the dark. This system provides a positive, repeatable seating that maintains optical alignment shot after shot. At only 26.5mm thick, the entire assembly is compact enough to maintain focus with a wide range of EOS lenses when paired with a compatible 17.5mm back focus ZWO camera.

    • Strong Magnetic Retention: Prevents the filter holder from accidentally sliding out, even when the telescope is pointed at zenith.
    • Rapid Filter Swaps: Makes it possible to switch between a light pollution filter and a narrowband filter in seconds without disassembling the camera train.

    M42 Threads and M54 Adapter for ASI Camera Compatibility

    The drawer features a native male M42x0.75 thread for direct connection to ZWO's smaller-format cooled cameras. For imagers using full-frame sensors, ZWO includes an M54M-M42F adapter. This ensures you can connect the filter drawer to larger cameras while maintaining the correct spacing and avoiding vignetting, making it a flexible solution for a wide range of ZWO's cooled camera lineup (excluding the ASI GT series).

  • Which ASI cameras are compatible with the ZWO Filter Drawer for EOS Lens?

    This filter drawer is designed for ZWO ASI cooled cameras that have a 17.5mm back focus distance. This includes many popular models, but it explicitly excludes the ASI GT series, which has an integrated filter wheel.

    Can I use the ZWO FD-EOS with my Canon EF-S lens and an ASI294MC Pro?

    Yes. The drawer is compatible with both Canon EOS and EF-S lenses. The ASI294MC Pro has the required 17.5mm back focus, making this combination a perfect match for wide-field astrophotography.

    How do I attach a full-frame camera like the ASI6200MC Pro to the ZWO FD-EOS?

    You use the included M54M-M42F adapter. The filter drawer has a native M42 male thread. The adapter converts this to an M54 male thread, which is required to connect to full-frame ASI cameras like the ASI6200 series.

    What is the advantage of the magnetic system in the ZWO FD-EOS?

    The magnetic holder allows for quick and easy filter changes without needing to unscrew anything in your imaging train. This is especially useful in the dark, as it reduces the risk of dropping a filter or upsetting the camera's rotation and focus.

    What type of filters fit in the ZWO FD-EOS Filter Drawer?

    The drawer is designed to hold one standard 2" mounted filter. The internal thread of the holder is M48x0.75, which is the standard for this filter size.

    Will the ZWO FD-EOS Filter Drawer cause vignetting with my lens?

    When used with the appropriate camera sensor size, vignetting should be minimal. Using a 2" filter is sufficient for up to full-frame sensors. The included M54 adapter for larger cameras also helps ensure the light path is not obstructed.

  • SKU ZWO-FD-EOS
    Accessory Type Filter Drawer
    Lens Compatibility Canon EOS / EF-S
    Camera Compatibility ZWO ASI Cooled Cameras with 17.5mm back focus (excluding GT series)
    Filter Compatibility 2" Mounted (M48x0.75 thread)
    Camera-Side Thread Male M42x0.75
    Optical Thickness 26.5mm
    Diameter 70mm
    Warranty 2 Years

    • ZWO Filter Drawer for EOS Lens

      × 1

    • M54M-M42F Adapter

      × 1

  • ZWO 2-Year Limited Warranty