Powerful filters are perfectly suitable for long-exposure landscape shots. They will allow you to capture a smooth water surface, do cloud photography, shoot car light trails, and capture ghost-like passersby in public places. Filters with a small number of stops will come in handy for taking portrait photos on a sunnys day.Portrait photographers and videographers use ND filters for taking photos with a shallow depth of field when the sun shines brightly. You can use a wider aperture without setting the shutter speed to the highest values. It will allow you to blur the background without overexposing your subject or making it out of focus.