Polarising filters such as this one prevent your photograph being marred by unwanted reflections from glass, water, and other surfaces which scatter light.
Kood 55mm Circular Polarising filter
Tiffen HT 58mm Circular Polarising Filter
Tiffen 72mm Black Pro-Mist 1/4 Circular Polarising Filter
Urth 72mm Plus+ Circular Polarising Filter
Sigma 49mm WR Circular Polarising Filter
Tiffen 62mm Circular Polarising Filter
