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ZWO M54 Adapter for Replacing EFW Spacing - ZWO-D70-M54F

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The ZWO M54 adapter is an adapter designed specifically for ASI cooled cameras. Instead of using the 20mm ZWO EFW, you can directly connect the adapter to the OAG-L with the addition of a 5mm sensor tilt adapter to reach 55mm back focus.

It has a thickness of 15mm. You can also insert a 2”filter into it.



The adapter supports 2” filters from third-party. Below are the requirements for the filters.

03 Requirements for filter from third party

04Mechanical Diagram

05 Mechanical Diagram

What is in the box?


  1. M54 adapter (15mm)
  2. M54M-M48F adapter
  3. 5-L8 screws * 8

The best solution of 55mm back focus length

Please note the following solutions are premised on that you are using the OAG-L with the cooled camera.

07 EN The best solution of 55mm back focus length

Detailed Connecting Guide

Connecting with ASI2600MM Pro as the example.

  1. Fix the filter to M54M-M48F adapter via threads.


  1. Fix the filter unit to the M54 adapter.


  1. Here we have an ASI2600MM Pro camera and an adapter unit. The four holes circled in red in the sensor tilt plate are the ones you are going to use to fix the adapter unit to the camera.

10 connect with 2600 (circles)

  1. Take 4 screws from the package, and use them to fix the M54 adapter to the camera.

11 connect with 2600

  1. Remove the M48 plate from OAG-L.

12 connect with 2600

  1. Align the hole positions in OAG-L to the smaller holes in the adapter, then use the rest 4 screws to fix OAG-L to the M54 adapter.

13 connect with 2600

  1. Reinstall the M48 plate on OAG-L.

14 connect with 2600

  1. Work done!

15 connect with 2600

Returns Policy

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

Items that have been opened, damaged or are otherwise unsaleable will be subject to a minimum 10% restocking fee, to be assessed by Telescopes Canada upon receipt of the returned goods

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the 'Complete Orders' link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.


We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

Typographical Errors and Order Cancellations

Telescopes Canada reserves the right to cancel an order due to an error in pricing by Telescopes Canada or one of our suppliers, equipment being no longer obtainable, or other events which are out of our control.

Client-Initiated Cancellations

Client-initiated order cancellations are accepted prior to delivery of the equipment to the customer, thereafter it is a return.

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