Purchased this item used on Amazon in August 2025. It has a vernier, so you can check the numbers for the best effect on the monitor or viewfinder, even if it's difficult to see. Then, you can attach it and adjust it to those numbers for maximum effect. (However, I was too lazy and just rotated it to judge. I think it's not a problem with a mirrorless camera.) I haven't used it much since I bought it, and there's no color unevenness or deterioration, so I think it's perfectly usable. I took macro shots of the details as much as possible. The white areas are due to the reflection of the metal, but they are actually black. However, please keep in mind that this is a used item. Kenko PL Filter Circular PL (W) Vernier 72mm for increasing contrast and removing reflections