PolarPro Quartzline Circular Polarising Filter A polarising filter offers fascinating possibilities to influence image results in a highly positive way. It not only allows you to avoid reflections on water, glass and all non-metallic surfaces. On top of that, it increases the image contrast and offers a rich colour dynamic. Especially skyscapes often appear impressively deep. As with all filters of the PolarPro Quartzline, the mount is made of robust brass. The polarising filter has an additional rotating ring (of course also made of brass). This allows you to control the desired efficiency and to check it on the display or monitor before taking the picture. Extremely neutral colour rendition Characteristic for PolarPro Quartzline filters is their perfect colour neutrality. Where image results with other filters may tend towards magenta or green, even if only slightly, Quartzline filters produce virtually no deviation from the real subject colours. These filters are your guarantee for true-to-life colours! High quality quartz glass PolarPro Quartzline filters are made entirely from 99.9% pure fused quartz glass for unparalleled durability and clarity. The glass has a very low refractive index of only 1.46, so there is no loss of sharpness when using this filter. In addition, quartz glass is also extremely temperature resistant and is ideal for sensors up to 100 megapixels. Simply perfect for photographers and filmmakers who like to work under extreme conditions! 16-fold multi-coating Each quartz filter glass is coated with 16 wafer-thin layers. The different coatings ensure, among other things, optimum scratch, water and grease resistance, avoidance of reflections and a strong reduction of the risk of vignetting. In addition, they ensure very high light transmission and hyper-neutral colour rendition. Filter mount made of robust brass A well-known problem with many filters is that they jam when screwed into the lens thread if they are not fitted exactly. Especially mounts made of aluminium or even plastic are easily damaged. The filter mounts of the PolarPro Quartzline are therefore made of robust brass. This high-quality metal makes screwing in and unscrewing much easier. And by the way, this gold-coloured filter frame also looks luxurious and aesthetic.