Promaster 4538 37mm UV Standard Filter

Bought this for my vintage 50mm and it threads on smooth as butter. The glass is crystal clear and hasn't affected image quality at all—just what a UV filter should be.

I was a bit worried about image quality with a standard UV filter, but this one is so clear I honestly can't tell it's on the lens. It threads on smoothly and protects the glass without any noticeable color cast.

The filter threads onto my 37mm lens without any binding, and I noticed it doesn't seem to affect the autofocus speed on my old kit lens. It's a simple clear protector, but I did have to clean a small speck of dust off the glass right out of the box.