HOYA PL-CIR (circular polarising) 52mm filter in original box .

Circular polarising filters eliminate reflections from non-metalic surfaces such as water and glass. Also increases contrast and colour saturation - typically makes the sky bluer and the clouds more prominent when photographing at right-angles to the direction of the sun. Great for making fish visible when photographing into water in harbours, rivers, lakes and pond (assuming there are fish in the water, of course). For use on lenses which accept 52mm screw-on filters. Filter factor is variable. Offered in its original plastic case. Selling because I no longer own any lens with a 52mm filter capacity.