The Cokin A122 filter is an effect filter that lets you tint part of a photo and, for example, get a highly saturated blue sky.This is a slightly weaker version of the Cokin A123 filter - it is more delicate in color.Cokin filters are mounted using a holder (holder), which is attached to replaceable mounting adapters, with diameters that can be adapted to your lens.System A (size S) is recommended for use with compact cameras with lens filters or amateur video cameras.