Ares Foto Ultra-Slim MC CPL Circular Polarising Filter with Multilayer Coating. Affordable CPL filter with high quality – ideal for ambitious amateur photographers. This polarising filter combines high quality with a truly unbeatable price. This makes the filter a perfect choice for demanding hobby photographers. For stronger colours and for suppressing reflections on non-metallic surfaces. CPL filters are one of the most important filters in the photo sector. They are almost the only filters whose effect cannot be reproduced in digital image editing. A CPL filter absorbs polarized light, which basically has two effects: The colour saturation is increased and the contrast is reinforced. The whole thing ensures bright colours. You can also use a CPL filter to suppress reflections on non-metallic surfaces. Appropriate surfaces include water, glass and varnish. The efficiency can be freely adjusted by turning the front part of the socket. Filter discs made from a particularly clear optical glass with multi-layer coating. The filter lenses are made from a particularly clear optical glass. The glasses have a multi-layer coating. The coating minimises reflections on the transitions between the air and the glass, which improves light transmission as less light is lost due to reflection. In addition, the coating causes a high scratch resistance. Precisely manufactured aluminium surround and front thread for other accessories. The filter has a black matte frame made of aviation grade aluminium. Thanks to the slim design, the filter can also be used in the wide angle area without causing edge shadows. On the front of the socket there is an internal thread for attaching another filter or lens cap.