Filter factor 2 (+1 stop)
80 Series Color Conversion Chart
80A increases color temperature from 3200-5500 degrees Kelvin (commonly used with 3200K lamps)
80B increases color temperature from 3400-5500 degrees Kelvin (commonly used with photoflood lamps)
80C increases color temperature from 3800-5500 degrees Kelvin (commonly used with flashbulbs)
80D increases color temperature from 4100-5500 degrees Kelvin (commonly used to remove extreme orange or red)
This filter measures 130 X 170mm and only fits the Cokin X-PRO series holder.
Reviews Cokin X-Pro Series Filter - X022 Blue (80C)