NiSi Brass Frame Pro Nano True Colour Circular Polariser

The NiSi Brass Frame Pro Nano True Colour CPL, released in 2026, puts NiSi's tried and tested True Colour optical tech in an ultra-thin premium brass frame with removable rotating pin. Why brass? Brass is strong and light, but very malleable, which makes a jam unlikely. 

For more information on what a circular polariser is and how to use it, read this article by Hougaard Malan.

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When it comes to enhancing images, a circular polarizer is probably the oldest trick in the book. It can change a pale sky to a deep blue one, turn foliage into a luminous super-green, light up autumn colours, saturate rainbows and even make water look crystal clear. The added contrast, saturation and clarity that a polarizer can give to images is nothing short of magic and every photographer should have one in their bag.

Contrary to its name, a polarising filter does not polarise light; it filters out polarised light. Light from the sun is polarised when it bounces off any non-metallic reflective surface like water, foliage or various air particulates. Polarised light robs images of colour, clarity and contrast and is in many situations undesirable. A polarizing filter removes this 'damaged' light and ensures that only unpolarised light reaches the camera sensor to produce a sharp, saturated and contrast-rich image.

For this reason, a polarizing filter is a very popular tool for any photographer, but especially for landscape photographers. 

What is the difference between a linear and circular polariser? Digital cameras' AF systems are not compatible with linear polarizers. When the world was transitioning from film to digital, linear vs. circular was a big debate, but it no longer is. For photographic purposes, you can assume that any polariser on the market nowadays is circular and not linear. 

More about NiSi's True Color CPL

The NiSi True Color CPL is designed to reduce glare and reflections from non-metallic surfaces, increase saturation and vibrancy in the sky and foliage while ensuring true color reproduction is at its best by eliminating the warming effect that many polarisers create. Our True Color CPL removes the warm tone seen with other brands of CPL filters and provides a closer true color representation of the scene. The True Color CPL features a unique two-tone frame with a silver back ring, black front ring and both are made from high-quality aluminum.  NiSi’s Sure Color CPL utilizes Cine seal technology which blackens the edge of the CPL for added durability. This technology reduces the influence of temperature fluctuations and keeps out condensation.

A Circular Polarizer Filter 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 polarized 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 polarized 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, foliage, and allows the camera to capture what is under the surface of shallow water.

Our proprietary NiSi Pro Nano Coating helps to reduce unwanted reflections and provides a waterproof and scratch-resistant layer to assist in the cleaning of unwanted fingerprints, dust and water stains. The slimline frame of the NiSi True Colour CPL is durable and tough and allows a lens cap to be attached for convenience.