What does this filter actually do?
It is a light pollution filter that selectively blocks the orange wavelengths (around 589nm) emitted by common sodium vapour street lights. This reduces the orange haze in night sky photos, improving contrast and colour balance for astrophotography.
What lens thread size is it?
The filter has an 82mm diameter thread, allowing it to be screwed directly onto lenses with an 82mm filter thread.
Is it compatible with the Cokin filter holder system?
Yes, as a Cokin P Series filter, it is designed to be used with the Cokin P Series filter holder, which attaches to the lens via an adapter ring.
What is the difference between the 'Clearsky' and other NUANCES filters?
The Clearsky variant is specifically calibrated to filter out the orange light from high-pressure sodium vapour lamps, which is a primary source of urban light pollution. Other NUANCES filters may target different light sources or offer different strengths of filtration.
Does using this filter affect exposure times?
Yes, like most filters, it will reduce the amount of light reaching the camera sensor. This typically requires a slightly longer exposure time or a higher ISO setting to compensate, which is standard practice in filtered astrophotography.
Can it be used for daytime photography?
While technically possible, it is specifically designed for night-time use to correct artificial light pollution. Using it in daylight would create a strong colour cast, as it blocks a specific portion of the orange spectrum.
What is the build quality like?
Cokin P Series filters are constructed with optical glass and feature a metal ring. They include multi-coating to help reduce reflections and protect the glass surface.