Reduces excess blue from flash indoors or in daylight flash-fill
Warms (balances) sea, sky and high altitude shots
Adds healthy look to skintones shot in open shade or overcast
Multi coated for flare prevention
"81" series are color corrective filters that 'warm' bluish tones. They are avaible in several strengths (A, B, C & EF) with 'A' being the mildest warming effect. Available in all popular sizes.