The Cokin Z-PRO 122 Graduated B1 Blue Resin Filter is color-toned in one half of the filter and has a smoothly graduated transition into the clear portion. Colored and clear image portions can be brought into the desired position by adjusting the filter in the holder.
Most Cokin graduated filters are available in two densities 1 & 2, with #2 being darker. Cokin color graduated filters can also be combined with other Cokin filters. Two color graduated filters rotated 180° to each other allow a composition of colors to fade into each other.
Z-PRO Filters are made of CR39 Resin which is a reputable lightweight and unbreakable optical material also used for ophthalmic glasses. The Z-PRO Series is recommended for focal lengths of 20mm onwards (in the 35mm format).
Adding color excitement to a drab sky
Changing the specific color in a scene to create a desired special effect
Enhancing the existing color or creating subtle color drama
Creating more balanced exposure in uneven lighting conditions