A polarizer is an optical filter that passes light of a specific polarization and blocks waves of other polarizations.
It can convert a beam of light of undefined or mixed polarization into a beam with well-defined polarization.
Polarizers are used in many optical techniques and instruments, and polarizing filters find applications in photography and liquid crystal display technology.
Polarizers can also be made for other types of electromagnetic waves besides light, such as radio waves, microwaves, and X-rays.
Circular Polarizer filters are used to reduce reflections from non-metallic surfaces (windows, water and so on) and increase density within the sky and/or foliage by absorbing reflected light. They also allow to emphasize details such as clouds and makes pictures crisper, with deeper color tones. Their effect cannot be achieved with a computer software.
Slim Frame
These excellent quality slim filters will help to reduce the chance of vignette on wide angle lenses, and is providing both-side thread, so you can attach other accessories on it such as your lens cap.

Specification:
Brand: Zomei
Available Caliber:72mm
Model:72mm CPL filter
Filter Material: Import optical glass
Thread Material: Aviation aluminum
72mm CPL filte for all 72mm lens for DSLR / SLR / DC / DV camcorder (Including lens for Canon Nikon Sony Pentax Fujifilm OLYMPUS ..)

Package Includes:
1 x 72mm Circular Polarizer Filter,1 x individual Storage Case