Occasionally I run across a scene that is too bright to allow a slow shutter speed. Or, I’m shooting a nighttime exposure and want the shutter open a LONG time. Or, maybe I want a portrait with a blurred background but the light is too bright to achieve a small aperture. Introducing the neutral density (ND) filter!
An ND filter is available in different opacities to allow for more or less light throughput. The newest breed is a variable ND filter. By attaching the filter to your lens and turning it, you can adjust to opacity from clear, through varying levels of opacity, to nearly opaque. Next to a polarizing filter, this could be the most important #filter in your gadget bag.
This image shows how a small depth of field can be achieved by using a neutral density filter to allow a larger aperture.
Check out this video by NickRains demonstrating the use of an ND filter. https://www.youtube.com/watch?v=ZbY_i45OX9w Give it a try. Have fun! KP