Cokin P131 is an E2 green half filter for the Cokin P system (M size). The M size is a series of Cokin filters designed for APS-C DSLR cameras with lenses with focal lengths over 28mm.
The Cokin P131 filter allows you to tint part of a photo. One half of the filter is neutral while the other half is green. The gradient starts in the middle of the filter and the green half is darker than in the E1 version (P130 filter). Cokin filters are mounted using a holder, which is attached to interchangeable mounting adapters of diameters that can be adjusted to fit your lens. The P system (M size) is recommended for use with compact interchangeable lens system cameras (mirrorless) and amateur SLR cameras with APS-C sensors, used with kit lenses or long-focus lenses. It can also be used with small video cameras. Basic features: