PolarPro Peter McKinnon Series Helix VND 2-5 Stop MagLock Lens Filter SystemMcKinnon Helix VND 2 5 Stop PM 2 5 The 2 5 Stop VND is perfect for shooting cinematic shutter speeds in most lighting conditions. The Helix MagLock Filter System was developed both to eliminate the hassle of threading filters on and off, while also providing a filter that's safely locked in place once installed. 2 5 Stops for shooting cinematic shutter speeds in most conditions 5x Faster than threading filters on Magnetic + quarter turn to fully lock