Neutral density (ND) filters are the most sought-after and necessary types of photographic filters for several reasons. For photographers, ND filters mean precise control over the amount of light that passes through the lens, providing greater creative control over the photography.

Generally, ND filters are categorized into 3 main groups:

• Low-density filters (ND2 – ND8)
• Medium-density filters (ND16 – ND200)
• High-density filters (ND500 – ND1000 / ND100000)

Low-density filters reduce shutter speed on bright days, allowing for a decrease in depth of field in very bright conditions or the use of a larger aperture to remain below the diffraction limit.

Medium-density filters help add motion and blur to objects in conditions that generally do not allow the camera's shutter speed to do so.

For more creative shots that rely on very slow shutter speeds, high-density filters are recommended. Filters like ND500 or ND1000 will help capture dramatic, unrealistic worlds that cannot be perceived by the human eye.

The ACCU-ND technology provided by HOYA places HOYA's ND filters ahead of other brands, as the image does not undergo negative effects from color shifts that may arise due to poor quality materials or manufacturing defects.

PROND filters in video production are also an indispensable tool, as they allow for shutter speed adjustment for natural motion that needs to match the frame rate.

The choice of ND filters depends on the photographer's intentions to achieve the desired effect in the image. For example, the combined use of filters can provide effects equivalent to those of higher ND filters.