Polarizing filters are amongst the most important filters in photography, both analogue & digital.They can be rotated in the mount,allowing the visible regulation of bluish grey veils of light which appear in the skyThe second beneficial effect of polarizing filters is the reduction of reflections on non -metallic surfaces i.e water,glass etc. Objects behind these surfaces are made clearly visibleUsing a B+W polarizing filter is a fascinating and effective way to enhance images at source,without the hassle of post production editing