ZWO M54 adapter to replace EFW

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.

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.

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.