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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 Nikon Lens Adapter for EFW

ZWO Nikon Lens Adapter for EFW

by ZWO
SKU ZWO-EFW-Nikon-II
$59.00 - $59.00
$59.00
$59.00 - $59.00
$59.00
Price Match Policy!
  • Connects Nikon F-mount lenses to ZWO Electronic Filter Wheels
  • Engineered for cameras with 6.5mm back focus
  • Provides 20 mm of spacing
  • Standard M42x0.75 female thread for EFW attachment
  • Compatible with 1.25", 31mm, and 36mm 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 Nikon Lens Adapter for EFW

    The ZWO EFW-Nikon Adapter connects your Nikon lenses to select ZWO filter wheels, creating a 20 mm thick, rigid connection for wide-field imaging. It is engineered specifically for ZWO cooled cameras with a 6.5 mm back focus requirement, such as the ASI1600, ASI533, ASI183, and ASI294. The adapter features a standard M42x0.75 thread for direct attachment to ZWO's 1.25", 31mm, and 36mm electronic filter wheels.

    Wide-Field Imaging with 1.25", 31mm, and 36mm Filters

    This adapter unlocks the optical power of your Nikon F-mount camera lenses for serious astrophotography. By integrating a ZWO 1.25", 31mm, or 36mm Electronic Filter Wheel (EFW), you can capture narrowband or LRGB data on sprawling targets like the North America Nebula (NGC 7000) or the Andromeda Galaxy (M31) using the same glass you trust for terrestrial photography.

    Precision Machined for a 6.5mm Back Focus

    The adapter's 20 mm thickness is precisely calculated to achieve correct spacing when paired with a ZWO EFW and a cooled camera that has a 6.5 mm back focus. This is a critical specification; cameras with a different back focus (such as 17.5mm) will not reach focus with this adapter. The all-metal, black-anodized construction ensures a secure, non-flexing connection between your lens and imaging train.

    • Compatible Cameras: Designed for ZWO models like the ASI1600, ASI183, ASI294, and ASI533, which all feature a 6.5mm back focus distance.
    • Secure Connection: The M42x0.75 female thread provides a direct, stable attachment to the filter wheel, preventing tilt and maintaining optical alignment.

  • Which cameras are compatible with the ZWO EFW-Nikon adapter?

    This adapter is designed exclusively for ZWO cooled cameras that have a 6.5mm back focus. This includes popular models such as the ASI1600 Pro, ASI183 Pro, ASI294 Pro, and ASI533 Pro. It is not compatible with cameras requiring 17.5mm of back focus.

    Which ZWO filter wheels work with this Nikon lens adapter?

    The ZWO EFW-Nikon adapter connects via an M42x0.75 thread to ZWO's electronic filter wheels that accept 1.25", 31mm, and 36mm filters. It is not designed for larger 2" filter wheels.

    Why is the 6.5mm back focus requirement so important for the ZWO EFW-Nikon adapter?

    Camera lenses, unlike telescopes, have a fixed and much shorter back focus distance. This adapter's 20 mm thickness is precisely machined to place the camera sensor at the exact focal plane of the Nikon lens when used with a ZWO EFW and a camera with 6.5mm of back focus. Using a camera with a different back focus will result in an inability to achieve a sharp image.

    Can I use the ZWO EFW-Nikon adapter without a filter wheel?

    No, this adapter is specifically designed to connect a Nikon lens to a ZWO Electronic Filter Wheel (EFW). It does not provide a direct camera-to-lens connection and relies on the filter wheel body for both threading and correct spacing.

    How do I use this Nikon adapter to image the Andromeda Galaxy (M31) with my ASI1600?

    For a large target like the Andromeda Galaxy (M31), you could use a 200mm Nikon lens. Attach the lens to the ZWO EFW-Nikon adapter, connect the adapter to your ZWO EFW loaded with LRGB filters, and then thread the EFW onto your ASI1600. This setup gives you a wide field of view perfectly framed for M31, while allowing you to capture full-color data with your monochrome camera.

    What is the advantage of using a Nikon lens with the ZWO adapter for the Rho Ophiuchi cloud complex?

    The Rho Ophiuchi cloud complex is an enormous region of the sky that requires a very wide field of view. Using a fast, wide-angle Nikon lens (e.g., 50mm f/1.8) with the ZWO EFW-Nikon adapter allows you to capture the entire complex in a single frame. This is a field of view that is difficult or impossible to achieve with most telescopes, making this adapter an essential tool for ultra-wide-field astrophotography.

  • SKU ZWO-EFW-NIKON-II
    Product Type Filter Wheel Adapter
    Lens Mount Nikon F-mount
    Camera-Side Thread M42x0.75 Female
    Required Camera Back Focus 6.5 mm
    Optical Thickness 20 mm
    Compatible ZWO EFW 1.25", 31mm, 36mm models
    Warranty 2 Years

    • ZWO EFW-Nikon II Adapter

      × 1

    • Spacers

      × 4

  • ZWO 2-Year Limited Warranty