Cokin P series colour correction filter for film photographers. Used but reasonable condition.
Blue Conversion filter to correct warm or amber light to neutral "Daylight". The 80A filter is a dark blue filter that corrects 3200K (Incandescent) light to 5500K (Daylight).
Like this:
https://cokinfilter.com/products/blue-80a
Cokin colour correction filter (St Leonards TN38)
This offer has been gifted to someone and is no longer available.