Features:<br />This Photo filter set is compatible with all 49mm~77mm lenses.<br />This ND filters set come in  ND2， ND4， ND8 different levels. <br />Apply slow shutter speed under strong sunlight exposure，<br />large aperture is available to create depth of field easily.<br />These filters are double threaded allowing additional filters or accessories to be mounted one over the other.<br />Made of high quality optical materials. <br />The number indicates the fraction by which light is reduced; for example，<br />ND2 cuts the light entering the lens by 1/2， ND4 by 1/4， and ND8 by 1/8.<br />Filters are packed in carry pouches with 3 pockets respectively.<br /><br />Specifications:<br />Material of filter: Optical glass<br />Back thread diameter (attach to lens， male thread): 49mm 52mm 55mm 58mm 62mm 67mm 72mm 77mm <br />Front thread diameter (attach additional filter， female thread):  49mm 52mm 55mm 58mm 62mm 67mm 72mm 77mm<br /><br /><br />Package List:<br />3 * ND Filter(ND2+ND4+ND8)