A circular polarizing filter allows you to create unique effects in your image which are not possible to create via postproduction, such as enhancing color contrasts and controlling reflections.
Equipped with a UV-absorbing high transparency polarizing film, the HD Mk II CIR-PL has 25% better light transmission than standard polarizing film used in current photographic filters.
This means that nearly 1/2 stop more light is entering the lens while yielding the same polarization effect, maintaining color balance while improving contrast and clarity.