Neutral Density Filters (ND) ArticlesWhat is a neutral density filter (ND)? How strong is my ND filter? What strength of ND filter should I use? How do I calculate the correct shutter speed using an ND filter? Minimising ‘light leak’? Doc navigationGraduated Neutral Density Filters (GND) → Was this article helpful to you? Yes 2 No How can we help? Name Email subject message