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Cokin P131 Square Graduated Emerald E2 Filter - Hard — main product image
Cokin

Cokin P131 Square Graduated Emerald E2 Filter - Hard

The Cokin P131 graduated emerald filter adds dramatic green color grading to skies and horizons with a precise hard-edge transition.

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Overview

The Cokin P131 Graduated Emerald E2 Filter is a creative tool designed for photographers who want to introduce bold color effects directly in-camera rather than relying entirely on post-processing. The filter features a graduated design with a rich emerald green on one half that transitions sharply to clear on the other, thanks to its hard-edge construction. This makes it particularly effective for scenes with a well-defined, flat horizon line — such as ocean views, open fields, or desert landscapes — where the color transition can be aligned precisely with the boundary between sky and ground.

Manufactured from Cokin's CR-39 optical resin, the P131 measures 84mm x 100mm and slides into any Cokin M (P) Series filter holder, allowing you to adjust the position of the transition line within the frame. The 3-stop density of the emerald portion not only adds color but also helps tame bright skies, providing some exposure balancing between the upper and lower portions of your composition. While the emerald effect is inherently dramatic and stylized, it can be used subtly at certain angles and lighting conditions to add atmosphere to dull, overcast scenes without heavy digital editing.

Key Features

Fits Cokin P-Series filter holder

Adds color in select areas

Manufactured with C39 optical resin

Up to 3-stop light reduction with hard Edge

Great for enhancing sky on flat days

Specifications

Brand
Cokin
Model
P131
Filter Type
Square Graduated
Color
Emerald (E2)
Edge Type
Hard
Density
Up to 3 Stops
Material
CR-39 Optical Resin
Dimensions
84mm x 100mm
Holder Compatibility
Cokin M (P) Series

Pros & Cons

👍 Pros

  • Hard-edge transition provides clean, precise color grading along defined horizons
  • CR-39 optical resin construction is lightweight and resistant to shattering
  • Sliding positioning in the P-Series holder allows flexible placement of the transition line
  • 3-stop density in the emerald portion helps balance exposure between sky and foreground

👎 Cons

  • Emerald green color effect is highly specialized and not suitable for natural-looking photography in most scenes
  • Hard-edge transition can appear unnatural with uneven or mountainous horizons
  • Resin material is more prone to scratching than glass filters and requires careful handling
  • Only compatible with Cokin M (P) Series holders, limiting use across different filter systems

Frequently Asked Questions

The P131 is designed for the Cokin M (P) Series filter holder. It will not fit the A, L (Z), or XL (X-Pro) series holders without an adapter.
A hard-edge graduated filter has a sharp, well-defined transition line between the colored and clear areas. This works best with flat, distinct horizons such as seascapes or open plains where you want a clean separation.
The colored emerald section provides up to 3 stops of light reduction, which also helps manage exposure differences between the sky and foreground.
It is manufactured from Cokin's CR-39 optical resin, which is lightweight, impact-resistant, and maintains consistent optical clarity across the filter surface.

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