The B+W 52 mm Kaesemann High Transmission Circular Polarizer MRC-Nano Filter is a smart accessory that helps in eliminating unnecessary reflections and glare. It has a filter factor that ranges from 2 to 2.8x and helps in reducing the exposure by approximately 1 to 1.5 stops. This filter can also reduce haze in landscapes and provide a greater tonal and color saturation. In addition, this filter also includes a thin brass filter ring, an MRC multi-resistant nano coating, and 52 mm front filter threads.