An ND filter cuts the light reaching the lens so that a cinematic shutter speed can be kept in sunshine and movement does not come out jerky. The numbers show the strength: ND8 and ND16 for cloudy weather, ND64 and ND256 in midday light; PL versions also cut reflections off water and glass. Sets of six filters cover a whole day without the bother of swapping. A filter has to fit the lens exactly — Freewell and Sunnylife have their own versions for different DJI models.
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An ND filter cuts the light reaching the lens so that a cinematic shutter speed can be kept in sunshine and movement does not come out jerky. The numbers show the strength: ND8 and ND16 for cloudy weather, ND64 and ND256 in midday light; PL versions also cut reflections off water and glass. Sets of six filters cover a whole day without the bother of swapping. A filter has to fit the lens exactly — Freewell and Sunnylife have their own versions for different DJI models.