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July 1st: Store will be closed for Canada Day. Orders placed that day will ship on July 2nd.
ZWO 2" to 1.25" Filter Adapter Ring

ZWO 2" to 1.25" Filter Adapter Ring

by ZWO
SKU ZWO-2-1.25FL
CA$22.00 - CA$22.00
CA$22.00
CA$22.00 - CA$22.00
CA$22.00
Price Match Policy!
  • Adapts 1.25" mounted filters for use in 2" filter holders
  • Compatible with ZWO 5-position and 7-position 2" filter wheels
  • Fits ZWO M42 and M52 filter drawers
  • M48 male to M26.5F female threading
1 in stock
Qualifies for FREE Shipping in Canada on orders over $500.
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • ZWO 2" to 1.25" Filter Adapter Ring

    The ZWO 2" to 1.25" Filter Adapter Ring enables you to mount your standard 1.25" filters into ZWO's 5-position and 7-position 2" electronic filter wheels (EFW). This single adapter ring makes your existing filter sets compatible with a 2" imaging train, saving you from having to immediately repurchase your entire collection.

    M48 to M26.5F Threading for 1.25" Filter Integration

    Don't leave your 1.25" narrowband or LRGB filters behind when you upgrade to a 2" filter wheel. This adapter threads directly into the M48 female receptacle of a ZWO 2" filter carousel or drawer, presenting standard M26.5F female threads to accept any 1.25" mounted filter. The low-profile design ensures it seats correctly without interfering with the wheel's rotation or causing clearance issues.

    Compatibility with ZWO 5-Position and 7-Position Wheels

    This adapter is machined specifically for the ZWO ecosystem, providing a secure, centered fit in both the 5x2" EFW and the larger 7x2" EFW. It is also fully compatible with ZWO's M42 and M52 filter drawers, allowing you to standardize on one set of 1.25" filters for multiple imaging setups, from wide-field refractors to larger SCTs.

    Upgrade to 2" Without Replacing Your 1.25" Filters

    The primary function of this adapter is to provide a cost-effective upgrade path. A complete set of 2" narrowband or broadband filters represents a significant investment. By using these adapters, you can continue to leverage your existing 1.25" filters with a larger sensor camera and 2" wheel, deferring the cost of new filters until it's absolutely necessary for your imaging goals.

  • Why use the ZWO 2" to 1.25" adapter instead of just buying 2" filters?

    It's a cost-saving measure. The ZWO 2" to 1.25" Filter Adapter Ring allows you to use your existing, less expensive 1.25" filters in a 2" filter wheel or drawer. This saves you from the significant expense of replacing an entire LRGB or narrowband filter set.

    Will this ZWO adapter cause vignetting with my APS-C camera in a 7x2" EFW?

    Using a 1.25" filter with an APS-C sensor will likely introduce some vignetting (darkening in the corners), especially in telescopes with fast focal ratios (f/5 or faster). While this can be corrected with flat frames, for the most evenly illuminated field with larger sensors, native 2" filters are recommended.

    Is the ZWO 2" to 1.25" adapter compatible with non-ZWO filter wheels?

    While the adapter uses a standard M48 male thread found on many 2" filter holders, its precise dimensions and clearance are only guaranteed for the ZWO 5x2" EFW, 7x2" EFW, and ZWO M42/M52 filter drawers. Its compatibility with other brands is not assured and may interfere with rotation.

    How do I install my 1.25" filter into the ZWO adapter ring?

    Simply thread your 1.25" filter into the female threads (M26.5F) of the adapter ring until it is snug. Then, you can thread the entire assembly into your ZWO filter wheel or drawer as if it were a standard 2" filter.

    Can I use this adapter in my ZWO M52 filter drawer for a full-frame camera?

    While the adapter physically fits in the M52 drawer, using a 1.25" filter with a full-frame sensor will cause severe vignetting and cut off a significant portion of the outer field. For full-frame imaging, using native 2" filters is essential to illuminate the entire sensor.

    What are the exact threads on the ZWO 2" to 1.25" Filter Adapter?

    The adapter features an M48 male thread on the outside, which connects to the filter wheel or drawer. It has an M26.5F female thread on the inside to accept the 1.25" filter.

  • SKU Number ZWO-2-125FL
    Product Type Filter Wheel Adapter
    Warranty ZWO - 2 Years

    • ZWO 2" to 1.25" Filter Adapter Ring

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  • ZWO 2-Year Warranty