The Cokin A729 Yellow CC (CC50Y) Filter is a colour correction filter that allows you to make blue tones more neutral in your image. Ideal in an environment with predominant lighting. The abbreviation CC50Y in the name indicates that it is a colour correction filter (CC) with a density of 0.50 in the colour yellow.
To find out which correction filter you need in a situation, you can use a colour temperature meter. The Cokin A729 filter has a size of 66 by 72 millimeters and is suitable for use in the Cokin A series filter holder.