This Cokin Evo Circular Polariser Filter is designed for use with an Evo Aluminium Z-Pro Series Filter Holder's front plate, or it can be placed directly on a lens that features 105mm front filter threads. When applied, it helps to reduce reflections and glare by filtering out light that has become polarized due to reflection from a non-metallic surface.

The light from the sun naturally becomes partially polarised due to reflecting off electrons in air molecules, causing the light to scatter into what appears as haze. A polarizing filter arranges, and filters, this directionally polarised light perpendicularly to the reflected light, allowing for the absorption of much of this light. This results in a noticeable reduction of glare and reflections from non-metallic surfaces, and an increase in the saturation of skies and foliage.

A circular polariser differs from a linear polarizer in that it contains a quarter wave plane in addition to the linear polarising filter. Due to how the light is broken down and filtered with a linear polariser, auto focus and exposure accuracy become skewed during use. When the light becomes circularly polarised, it permits the use of these functions.

Cokin Evo circular polariser filters are constructed from Schott glass for increased optical clarity as well as color fidelity, and promote nearly flat attenuation of visible and UV light. This 105mm Evo circular polariser filter features a durable, lightweight, 7.50mm-thick aluminium-alloy filter ring assembly with a front ring that can be rotated to adjust the intensity of the polarisation effect. These rings minimise the potential for vignetting, and the front ring also includes corresponding 105mm front filter threads for use with other screw-on filters.

To help eliminate internal ghosting and reflections, each glass surface of the 105mm Evo Circular Polariser Filter features 16 layers of Cokin's EVERCLEAR 5 anti-reflection coating. These coatings are resistant to oil, dust, dirt, and scratches, offering greater protection to the filter and help it to stay clean for longer than with uncoated filters. The coatings are also hydrophobic, resulting in an improved beading effect when in contact with water for greater cleaning efficiency.