Promaster 46mm UV HGX Prime

The ground and polished edges are so smooth I actually forgot it was on the lens until I checked the front element—zero glare even shooting straight into a sunset. It's pricey for a UV filter, but the clarity makes my primes feel sharper than before.

Finally, a UV filter that doesn't soften my sharpest lens—the multi-coating is truly invisible. It threads on smoothly and hasn't introduced any glare, even shooting into the sun. Exactly what I needed for front element protection without sacrificing image quality.

The individually ground edges are what sold me—they sit perfectly flush on the lens without any wobble when I thread it on. Visible light passes through so cleanly that I forget the filter is even there until I need the protection.