A high quality neutral density filter, which reduces the amount of light entering by 3 stops. It ensures perfect exposure balance at high contrast ranges, for example in sun ups and downs. As it allows long-term exposure, it can also gently "smooth" flow waters and waves - creating almost beautiful images. When used for video recording, it creates the well-known and popular "cinema effect", which gives the viewer a great cinema experience. Characteristic of PolarPro Quartzline filters is their perfect colour neutral. Where picture results with other filters may tend to magenta or green, although only slightly, Quartzline filters produce practically no deviation from the real subject colours. These filters are your guarantee for true-to-life colours! PolarPro Quartzline series filters are made of 99.9% pure quartz glass, which ensures unparalleled durability and clarity. The glass has a very low refractive index of only 1.46, so that no loss of sharpness occurs when using this filter. In addition, quartz glass is also extremely temperature-resistant and is ideal for sensors up to 100 megapixels. Perfect for photographers and filmmakers who like to work in extreme conditions! Each quartz filter glass is coated with 16 ultra-thin layers. The various coatings ensure optimal scratches, water and grease resistance, avoid reflections and a strong reduction in the risk of vignetting. In addition, they ensure a very high light transmission and a hyperneutral colour reproduction. A well-known problem with many filters is that when screwed into the lens thread, they are concealed unless they are exactly attached. Particularly aluminium or even plastic sockets are quickly damaged. The PolarPro Quartzline filter holders are therefore made of robust brass. This high-quality metal makes screwing and unscrewing much easier. And by the way, this gold-coloured filter holder also looks luxurious and aesthetic.