Promaster 43mm UV HGX Prime

I was a bit skeptical about spending this much on a filter, but the way it cuts UV haze without any color cast is honestly impressive. The coating is so clean that I keep forgetting it's even on the lens.

The individually ground and polished glass really makes a difference—my landscapes look noticeably clearer without that hazy blue cast. Screwed it onto my lens and it hasn't affected autofocus speed at all.

I’ve been using this filter on my favorite prime lens and the image clarity is noticeably better than with my old cheap UV. The individual grinding and polishing really shows—no loss of sharpness whatsoever.