K&F CONCEPT Camera Lens Filter Set MCUV+CPL+ND4 37/46/49/52/55/58/67/72/77/82mm
AU $42.99
They allow to decrease the shutter speed in order to achieve motion blur (waterfalls, ocean, clouds.) and/or to reduce depth of field in very bright conditions. As they are "neutral", ND filters do not affect color rendition.
