Cokin P Series Gradual Neutral Grey filters reduce the amount of light through the ND area without affecting the color balance. It restores the balance between the main subject and the foreground/background. Often used to darken over exposed skies in landscape photography.
P120 - this Gradual Neutral Grey reduces the total amount of light reaching the film without affecting the color balance. It restores the balance between the main subject and the foreground/background. 120 is colour 1.
P121 (ND8) - this cokin Gradual Neutral Grey reduces the total amount of light reaching the film, but without affecting the colour balance. It restores the balance between the main subject and the foreground/background. 121 is color 2.
P121L (ND2) - Very light gradual filter, same colour but lighter tone than standard 121.
P121M (ND4) - Progressive graduation from the middle to the top of the filter, same colour as121 but lower tone. Only ND4 gradual filter.
P121S (ND8) - Progressive graduation from the middle to the top of the filter, same colour & tone than 121.
P121F (ND8) - Progressive graduation from the middle to the top of the filter, same colour & tone than 121.
