As of October 2020, NiSi offers three different CPLs, each with a key difference. The primary difference lies in the colour tone and choosing should be fairly easy.
- Natural CPL – This filter has no colour tone and renders colours true to the original scene. It’s important to keep in mind that polarization changes certain colours slightly, so if you pixel peep you will come across some difference and that is all natural and nothing to worry about.
- Landscape Enhanced CPL – This filter has a subtle cool tone and it is slightly stronger than most CPL’s on the market. It is designed with landscape photographers in mind and helps to cut through more glare, while adding extra contrast to skies and giving water bodies that fresh, cool feeling.
- Standard CPL – This filter has a subtle warm tone, which can be great for anything from landscapes to architecture.
It all comes down to personal taste and deciding whether you want a cool or warm tone or to keep all colour enhancement to the computer.
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.
NiSi's PRO Nano Standard polarisers are made from top of the range optical pro glass, mounted in a brass ring and treated with a cutting edge water-repellant and scratch-resistant nano-coating. Brass threads don't jam nearly as easily aluminium.
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.