M54-M48 extender 21mm

Finally got the spacing right on my imaging train—this adapter threaded on smoothly without any wobble. The 21mm extension fits perfectly between my reducer and camera.

I needed exactly 21mm of spacing for my filter wheel to reach focus, and this extender did the trick without adding any tilt. The M54 to M48 threading engaged smoothly and held everything rigid in the imaging train.

The threads are machined perfectly smooth—no wobble or binding when screwing it into my filter wheel. This 21mm extender gave me just the right back focus for my setup, and the anodized finish blends right in.