The Marumi Slim Fit UV Filter 40.5 mm is an extra-thin filter that is ideal for use with wide-angle lenses. The filter is 5.3 mm thick, while a standard UV filter is 7.2 mm thick. It is made from the same glass as the DHG UV filter series and features a UV multi-coating that adds extra quality to the filter. The UV filter blocks invisible UV rays that often cause blurriness in photos. Additionally, the UV filter enhances color reproduction and creates higher contrast in images. The exposure time is not extended, allowing the filter to remain attached to the lens at all times. UV filters are perfect for photography in the mountains, by the sea, or in areas with very clean air. The filter increases brilliance and avoids distracting bluish veils. Furthermore, it serves as important protection for the lens. The surface of the UV filter is much harder than that of the camera lens, making it useful for protecting your lens during cleaning.