Cokin Filter A153 Neutral grey ND 4

Preserve your film from over exposure.
For use in bright light, high-sensitivity emulsions (400 ISO and over) must be
used at high speeds and small apertures. Without altering colours, COKIN Neutral Density Filters will allow you to gain the 2 apertures you need to allow you to play with backgrounds, distance and depth of field.
Neutral Density Filters allow you to use the low speeds you need to give an
impression of motion.