The Hama Polarising Filter can be used to remove non metallic reflections from shiny surfaces and enhance contrast under certain conditions making blue skies darker. The Hama Polarising Filter is made from a thin sheet of polarising material which is laminated between two circular pieces of glass and mounted in a frame. You can rotate the filter while it is fastened to the lens, this affects the filters angle of polarisation and therefore altering the amount of polarised light in the scene which can pass through. - strong colours - blue sky / white clouds - removes reflections, especially on glass - a Must for every amateur and professional use - brings depth in your pictures - for all autofocus cameras - also UV filter Colour Mount - Black Filter Thread (Diameter) - 49 mm Filter Type - Polarising circular