NiSi 82mm S5 濾鏡轉接環（Sigma 14-24mm f/2.8 DG Art Series – Canon 及 Nikon 接環）

Finally an adapter ring that actually stays flush and doesn't let light leak in—the threading on mine is precise enough that it screws on smoothly without any wobble. Works exactly as needed for fitting my Sigma 14-24mm onto the S5 filter system.

I was a bit skeptical about using a third-party adapter, but the threading on this ring is incredibly precise—no wobble or cross-threading at all. It lets me use my S5 filters on my 82mm lens without any issues.

Fits perfectly on my 14-24mm Sigma lens, and the threads are smooth enough that I can swap filters quickly in the field. No vignetting even at the widest end, which was my main worry.