ZWO M54 adapter replacing EFW


$29.00 $26.10



SKU: ZWO D70-M54F Category:

Product Description

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 OAG-L with the addition of 5mm sensor tilt adapter to reach 55mm back focus.

It has a thickness of 15mm. You can also insert an ZWO 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

Our website is continuously updated with the most recent camera drivers as well as software for DSO and planetary imaging. Please make sure the most recent Driver and software have been installed before you start shooting:

It is also recommended to read the Manuals first before shooting.

Shipping & Delivery

Fast Shipping: we will choose DHL, UPS, FedEx etc to deliver it. Usually you will get your package within 15-20 days.

  • Fast Shipping(amount ≧ 199USD) for free
  • Fast Shipping(amount < 199USD) : $30.00 (We do not provide free shipping from now on.)


  1. It will take around 60-90 days for shipment via ePacket/China Post Registered Air Mail/EMS, which can’t be guaranteed due to force majeure. If you can’t get the air mail package after 2months, please let us know ASAP:
  2. Customers from Brazil and Chile should leave a message to provide your CPF or CNPJ as your custom needs it.
  3. Customers from Russia need to provide the complete English name with three words as well as the English shipping address.

Tracking site


China air mail:



  • The price list on our website is USD without tax.
  • Please note that buyers are liable to pay tax involved, such as Import tax, VAT , customs handling fee, etc. The additional fees may be collected at time of delivery by courier.
  • For best local service we advise customers buy our cameras from local dealers.


Warranty & Return

1. ZWO hereby declares that it will provide customers with a warranty period of 2 years for ZWO branded products (excluding APO), as per this policy. APO products will be covered by a 1-year free warranty service, starting from the day following the receipt of the product by the customer. For ASIAIR Plus users, the warranty period will commence from the day of device activation.

2. If a User encounters the following Dead on Arrival (DOA) and contacts ZWO within the corresponding time limit to issue the Product purchase invoice and relevant evidence, ZWO will provide door-to-door pick-up service and, as appropriate, after-sale replacement (or partial replacement), repair or return (or partial return) service for the following Products:
1) Product quality problem
Provided that a User detects a quality problem and contacts ZWO within 30 days after receipt of the Products, and ZWO support team confirms that the Products indeed have a quality problem or defect after their inspection, ZWO will provide free replacement service towards such Products;
2) Product transportation problem
Provided that a User finds obvious signs of bubbling, serious overstocking, or deformation on the outer package of the Products upon receipt of the Products, and provides ZWO with pictures of the outer package and proof of receipt within 3 days after receipt of such Products, ZWO support team will verify the actual shipper and determine the responsible party for such transportation problem. In the event that ZWO is the actual shipper, ZWO will be responsible for providing the relevant return or replacement service, however, if the Products are directly sold or transported to the User by an agent of ZWO, the agent will be responsible for providing the relevant return or replacement service.

3. If the Products are under the following circumstances, they are not within the scope of warranty service, ZWO may provide maintenance services to the Users:
1) The Warranty Period of the Products has expired; or
2) The Products are injected into liquid or affected by moisture or corrosion; or
3) The Products are damaged by an external force (such as the broken of the camera protection window glass, the deformation of the product shell, the broken of the USB port, etc.); or
4) Disassembling, repairing by a third party, refurbishment of the Products (such as downloading erroneous firmware) without the written authorization of ZWO; or
5) The product system is modified, or the maintenance notice is lost or changed; or
6) Product quality problem caused by installation not following the requirements or instructions for the Products; or
7) Physical damage or failure of the Products caused by the force majeure (such as strong vibration or extrusion such as flood, fire, earthquake, or thunder stroke); or
8)Damage caused by the improper User operation during the period of shooting or use, such as using without the equipment protection or direct shooting of the sun; or
9) No valid purchase invoice or warranty certificate; or
10) The Products are second-hand products.
Any quality problem with the accessories or other parts of the Products is not a condition for the return or change of the Products, and the User may solely request to replace the accessories with new ones, which shall be handled after verification by ZWO support team.
If the issue with your ZWO product was caused by certain damage (such as severe damage not covered by the 2-year warranty), you might have to pay the replacement value.

4. For the normal repair or replacement of the Products during the Warranty Period, the User will bear the return cost. When returning the Products, Users shall specify the actual reasons for the damage to the Products, and shall provide the corresponding valid certificates, such as pictures or videos, etc.
For the Products that need to be replaced after being confirmed by ZWO in writing, the User shall return the Products with the complete package, together with all accessories, manuals, etc., to the address designated by ZWO.
By sending back the product to ZWO, the User agrees to pay out-of-warranty fees that may arise during the repair process of the product. ZWO will send back the product after charging.

5. If a User encounters any problem during the use of ZWO Products, you may at any time contact ZWO for technical support via ZWO Support.

For the Products that need to be returned for after-sales service, ZWO will provide the corresponding RMA code for reference.
ZWO will not accept any products having no RMA code that have been returned privately without ZWO written confirmation.

6. If a User purchases the ZWO Products from a ZWO agent, the User may contact the ZWO agent directly for the relevant after-sales service.

Do you have question, answer or comment? Post here!

  1. Avatar


    Actually I got my solution by using a T2 Tilter I happened to have, better than using this adaptor. Gives me 61mm back focus and if I want 56mm back focus I can split the tilter. The ASI174MM-Mini should be positioned just nicely in the OAG.

    M48 tilt adaptor (5) – OAG-L (17.5) – T2 Tilter (10 or 5) – T2-T2 adaptor (2) – EFWmini (20) – ASI294MM PRO (6.5)


    • Avatar


      Thanks for sharing.


  2. Avatar


    Of course the M54M-M48F would need to be a M54M-M42/T/T2F adaptor!


  3. Avatar


    I am planning to use this adaptor in the following stack which should amount to 66mm which is fine as my OTA has plenty of back focus flexibility:

    M48 tilt adaptor – OAG-L – M54 adapter – M54M-M48F – T2-T2 adaptor – EFWmini – ASI294MM PRO

    Will the M54/M48/T2 set of adapters work to get the OAG-L and EFWmini connected?

    Is my 66mm correct? Is there a better solution ZWO offer?




    • Avatar


      Sorry, we do not have a solution to reach 66 mm back focus yet.



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