The Cokin P020 Blue 80A Filter is for use with a film camera using daylight colour film, or alternatively a digital camera in
...The Cokin P027 WARM P-Series filter is a colour correction filter with the same purpose as filter 81A filter, but with a stronger
...The Cokin P020 Blue 80A Filter is for use with a film camera using daylight colour film, or alternatively a digital camera in automatic mode. It is used as a colour conversion filter to allow shooting under an artificial light source. The Blue (80A) Colour filter increases the colour temperature from 3200 K to 5500 K, to allow shooting under tungsten light.