ProMaster ステップアップリング（40.5mm→52mm）

Finally got this ring for my 40.5mm lens and it threads on smoothly with no wobble—fits my 52mm filters perfectly. The precision machining really shows.

Finally, a step-up ring that actually sits flush instead of wobbling. The 40.5-to-52mm conversion is spot-on, and the precision machining means my lens cap fits without any forced twisting. Took a few seconds to screw on, but it's held tight through a whole shoot.

Finally got my 40.5mm lens to take a 52mm filter without any wobble. The threads are cut perfectly smooth, and it tightened down flush with zero play. Exactly what I needed for a quick setup change.