NiSi 39mm Pro Nano HUC 保護鏡

I was worried about image quality with a filter on, but the nano coating really does repel smudges and keeps everything crystal clear. It's slim enough that my lens cap still fits perfectly.

Put this on my main lens and the first thing I noticed is how well the multi-coating handles flare—shooting into a sunset showed zero ghosting. It threads on smooth, doesn't add any noticeable weight, and I feel a lot better about accidental bumps now.

The glass is so clear I honestly forget it’s even on the lens, and the slim ring doesn’t cause any vignetting even with my wide-angle shots. It’s saved my front element from a couple of close calls already.