Used, as everyone knows. A gem that came out while cleaning. Manufacturer: Kenko Product Name: Optical Filter Y2 Yellow JIS Symbol: SY-48-2 Exposure Factor: 2 Notes: No box, no instruction manual Effect: Contrast similar to how the eye perceives Diameter Size: 55mm Condition: Some scratches and dirt → Slight scratches on the frame Photo 1: Filter body Photo 2: Case exterior Made of glass, so it doesn't deteriorate easily.