Overview: High quality optical glass for increased picture contrast Eliminate reflection from non-metallic surfaces & picture washout Circular polarizer (CPL) enables you to remove unwanted reflectionoriginating from non-metallic surfaces such as glass & water which is not possible to achieve using computer software In addition to the reflection removal feature, CPL filters also ensure the colors taken to be more saturated & contrast which is especially useful during outdoor picture taking under bright sunny conditions (eg: contrast between buildings & sky are further enriched) Specification: Optics: Clear optical glass with CPL film Housing: Aluminum Mounting diameter: 25mm to 86mm Inner thread: Yes Weight Approx:42.1g Size Approx:5.4 x 0.6 x 8.9