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Filter factor 4 increases the exposure time / aperture size by 2 stops
work creatively with less light
reduces light evenly in the image without altering the colours
Take photographs or shoot video with a wide aperture
1x walimex pro ND 4 filter, 1x plastic case with foam inlay
Grey filters, also referred to as ND filters (neutral-density filters), reduce the entire visible light spectrum evenly throughout the entire filter. Colours and contrast are not affected by this. Reducing the light can have several different useful applications. Increasing the exposure time can produce flowing effects with moving water, or enables shots to be taken with a wide aperture and a long exposure, even in bright conditions. The grey filter used here with factor 8 increases the exposure time / aperture width by 3 stops.