ZWO M54 adapter to replace EFW

Name: ZWO M54 adapter to replace EFW
Brand: ZWO
SKU: XSHOPS-SKU-4969729
Price: 18.56 USD
Availability: InStock
Rating: 4.2 (5 reviews)

ZWO M54 adapter to replace EFW - Main image

$18.56 ~~$29~~ In stock

Category: Astrophotography Accessories

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 to reach 55mm back focus.

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

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.

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Express Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

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Standard Shipping · United States: $0.00

Express Shipping · United States: $3.99

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United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

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Customer Reviews (4.2 / 5 · 5 reviews)

Carter C. ★★★★★ Oct 21, 2026

This adapter let me ditch the EFW and dial in a precise 55mm back focus with my OAG-L setup. The threading is smooth and it feels solidly machined, which is exactly what you need for critical astrophotography gear.

Michael V. ★★★★★ Oct 18, 2026

Finally got the spacing right for my OAG-L setup — this adapter locks in at exactly 55mm back focus without any guesswork. The direct connection feels much more solid than stacking spacers.

Lucy ★★★★☆ Oct 20, 2026

Finally got my back focus to exactly 55mm without the extra bulk of the EFW. The OAG-L connection feels solid and secure, though I wish it came with slightly longer screws. Works perfectly for my imaging train setup.