M54M-M48F-2mm adapter

The knurled edge gives you a solid grip for threading, which I really appreciated when swapping filters in the dark. This 2mm adapter sits flush with my M54 filter drawer and eliminated the slight back-focus issue I had.

I was worried the 2mm thickness would cause alignment issues, but it fits perfectly between my filter wheel and camera. The machining is precise and the knurling gives me just enough grip to tighten it securely.

The knurled edge makes this thin adapter surprisingly easy to grip and tighten, even with cold fingers. It sits perfectly flush between my filter drawer and EFW, eliminating any back focus issues I was having.