M66母轉M54公（用於SW Esprit 100）

Finally got my Esprit flattener connected to my filter wheel without any wobble — the M66 and M54 threading is precise and tight. Was worried about back focus but this adapter adds just the right spacing. Solid build, no light leaks at all.

The M66 to M54 adapter threads are cut cleanly and it mated with my flattener on the first try, no cross-threading at all. Backfocus stayed exactly where it should, so my M54 filter wheel and camera went on without me having to re-shim anything. Solid little piece of machining.

Screwed right onto the Esprit 100 flattener and mated my M54 filter wheel without any wobble or play. Threads are cut clean at M66/1.0 and M54/0.75, so it seats flush with no tilt in the corners.