These filters allow for long shutter speeds even on films with higher sensitivity to represent motion in the image by blurring, e.g. in waterfalls and streams, fountains, clouds or moving cars. This also allows you to achieve larger aperture openings for a smaller depth of field, which helps a subject, e.g. a portrait, to stand out clearly from its background. In addition, they have the effect that the film sensitivity was reduced accordingly, so that even highly sensitive films (i.e. above ISO 400 27°) can be used in bright daylight. A highlight is also the feature that film and video cameras with non-adjustable shutter speeds are possible even in bright environments such as snow and sandy beach or in extremely bright lighting, while otherwise overexposure occurs.