Roberts and UsedPhotoPro will be closed Monday December 25th. Online orders may still be placed but won't process to ship until we open again at 9am December 26th.
Neutral Density 154 reduces the light 3 full stops. Neutral density filters will allow you to gain the 1, 2 or 3 apertures you need to vary the background, distance and depth of field. Neutral density filters allow you to use the low speeds needed to give an impression of speed.