This red filter is ideal for strong contrast improvement since it absorbs green and blue completely and enhances red. Clouds are dramatically improved almost to the mood of a thunderstorm. It is more effective in cutting through haze, and moonlight effects are easily accomplished. It is also suited for infrared photography.
This filter measures 85 x 85mm and fits the Cokin P series holder and the Hitech "P" series holder.
Filter factor is 4 (+2 stops)