The PolarPro variable ND filter is equipped with a haptic feedback mechanism that allows changes in filter settings without the photographer needing to take an eye off the viewfinder. The rigid aluminium ring rests comfortably in the hand, turns easily and has a preset filter range that eliminates the risk of cross-polarisation and vignetting. The Defender 360 casing protects the filter from water and dust, and it allows the filter to be mounted without touching the glass element.