The 37MM 2 in 1 CPL+Variable ND2~ND32 lens filter from K&F Concept is a versatile solution for photographers who want to combine the benefits of a polarizing filter with the flexibility of a variable neutral density filter in one product. With a filter thread of 37 millimeters, it fits a variety of lenses and allows for precise control over the amount of light hitting the sensor. The filter features a special green coating made up of 28 layers to minimize reflections and maximize image quality. Additionally, the filter is waterproof and scratch-resistant, making it ideal for use in various weather conditions. The combination of these features makes the filter an essential tool for creative photography and videography.